1.
Metamorphic rock
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Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means change in form. The original rock is subjected to heat and pressure, causing profound physical and/or chemical change, the protolith may be a sedimentary, an igneous, or even an existing type of metamorphic rock. Metamorphic rocks make up a part of the Earths crust. They are classified by texture and by chemical and mineral assemblage and they may be formed simply by being deep beneath the Earths surface, subjected to high temperatures and the great pressure of the rock layers above it. They can form from tectonic processes such as continental collisions, which cause horizontal pressure and they are also formed when rock is heated up by the intrusion of hot molten rock called magma from the Earths interior. The study of rocks provides information about the temperatures and pressures that occur at great depths within the Earths crust. Some examples of rocks are gneiss, slate, marble, schist. Metamorphic minerals are those that only at the high temperatures and pressures associated with the process of metamorphism. These minerals, known as index minerals, include sillimanite, kyanite, staurolite, andalusite, and some garnet. Other minerals, such as olivines, pyroxenes, amphiboles, micas, feldspars, and quartz, may be found in metamorphic rocks and these minerals formed during the crystallization of igneous rocks. They are stable at temperatures and pressures and may remain chemically unchanged during the metamorphic process. However, all minerals are only within certain limits. The change in the size of the rock during the process of metamorphism is called recrystallization. Both high temperatures and pressures contribute to recrystallization, high temperatures allow the atoms and ions in solid crystals to migrate, thus reorganizing the crystals, while high pressures cause solution of the crystals within the rock at their point of contact. The layering within metamorphic rocks is called foliation, and it occurs when a rock is being shortened along one axis during recrystallization. This causes the platy or elongated crystals of minerals, such as mica and chlorite and this results in a banded, or foliated rock, with the bands showing the colors of the minerals that formed them. Textures are separated into foliated and non-foliated categories, foliated rock is a product of differential stress that deforms the rock in one plane, sometimes creating a plane of cleavage. For example, slate is a metamorphic rock, originating from shale
2.
Chemical formula
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These are limited to a single typographic line of symbols, which may include subscripts and superscripts. A chemical formula is not a name, and it contains no words. Although a chemical formula may imply certain simple chemical structures, it is not the same as a full chemical structural formula. Chemical formulas can fully specify the structure of only the simplest of molecules and chemical substances, the simplest types of chemical formulas are called empirical formulas, which use letters and numbers indicating the numerical proportions of atoms of each type. Molecular formulas indicate the numbers of each type of atom in a molecule. For example, the formula for glucose is CH2O, while its molecular formula is C6H12O6. This is possible if the relevant bonding is easy to show in one dimension, an example is the condensed molecular/chemical formula for ethanol, which is CH3-CH2-OH or CH3CH2OH. For reasons of structural complexity, there is no condensed chemical formula that specifies glucose, chemical formulas may be used in chemical equations to describe chemical reactions and other chemical transformations, such as the dissolving of ionic compounds into solution. A chemical formula identifies each constituent element by its chemical symbol, in empirical formulas, these proportions begin with a key element and then assign numbers of atoms of the other elements in the compound, as ratios to the key element. For molecular compounds, these numbers can all be expressed as whole numbers. For example, the formula of ethanol may be written C2H6O because the molecules of ethanol all contain two carbon atoms, six hydrogen atoms, and one oxygen atom. Some types of compounds, however, cannot be written with entirely whole-number empirical formulas. An example is boron carbide, whose formula of CBn is a variable non-whole number ratio with n ranging from over 4 to more than 6.5. When the chemical compound of the consists of simple molecules. These types of formulas are known as molecular formulas and condensed formulas. A molecular formula enumerates the number of atoms to reflect those in the molecule, so that the formula for glucose is C6H12O6 rather than the glucose empirical formula. However, except for very simple substances, molecular chemical formulas lack needed structural information, for simple molecules, a condensed formula is a type of chemical formula that may fully imply a correct structural formula. For example, ethanol may be represented by the chemical formula CH3CH2OH
3.
Lazurite
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Lazurite is a tectosilicate mineral with sulfate, sulfur and chloride with formula,8. It is a feldspathoid and a member of the sodalite group, lazurite crystallizes in the isometric system although well formed crystals are rare. It is usually massive and forms the bulk of the lapis lazuli. Lazurite is a blue to greenish blue. The colour is due to the presence of S−3 anions and it has a Mohs hardness of 5.0 to 5.5 and a specific gravity of 2.4. It is translucent with an index of 1.50. It is fusible at 3.5 and soluble in HCl and it commonly contains or is associated with grains of pyrite. Lazurite is a product of metamorphism of limestone and typically is associated with calcite, pyrite, diopside, humite, forsterite, hauyne. Other blue minerals such as the carbonate azurite and the phosphate lazulite may be confused with lazurite, lazurite at one time was used as a synonym for azurite. Lazurite was first described in 1890 for an occurrence in the Sar-e-Sang District, Koksha Valley, Badakhshan Province and it has been mined for over 6,000 years in the lapis lazuli district of Badakhshan, Afghanistan. It has been used as a pigment in painting and cloth dyeing since at least the sixth or seventh century CE and it is also mined at Lake Baikal in Siberia, Mount Vesuvius, Burma, Canada, and the United States. The name is from the Persian lazward for blue, lazurite and hauyne seem to have the same structure and both are sulfate-dominant minerals. Lazurite is a pigment and has a blue streak. Many hauynes have a pale blue streak and are translucent. The difference might be a consequence of the redox state
4.
Crystal system
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In crystallography, the terms crystal system, crystal family and lattice system each refer to one of several classes of space groups, lattices, point groups or crystals. Informally, two crystals are in the crystal system if they have similar symmetries, though there are many exceptions to this. Space groups and crystals are divided into seven crystal systems according to their point groups, five of the crystal systems are essentially the same as five of the lattice systems, but the hexagonal and trigonal crystal systems differ from the hexagonal and rhombohedral lattice systems. The six crystal families are formed by combining the hexagonal and trigonal crystal systems into one hexagonal family, a lattice system is a class of lattices with the same set of lattice point groups, which are subgroups of the arithmetic crystal classes. The 14 Bravais lattices are grouped into seven lattice systems, triclinic, monoclinic, orthorhombic, tetragonal, rhombohedral, hexagonal, in a crystal system, a set of point groups and their corresponding space groups are assigned to a lattice system. Of the 32 point groups that exist in three dimensions, most are assigned to only one system, in which case both the crystal and lattice systems have the same name. However, five point groups are assigned to two systems, rhombohedral and hexagonal, because both exhibit threefold rotational symmetry. These point groups are assigned to the crystal system. In total there are seven crystal systems, triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, a crystal family is determined by lattices and point groups. It is formed by combining crystal systems which have space groups assigned to a lattice system. In three dimensions, the families and systems are identical, except the hexagonal and trigonal crystal systems. In total there are six families, triclinic, monoclinic, orthorhombic, tetragonal, hexagonal. Spaces with less than three dimensions have the number of crystal systems, crystal families and lattice systems. In one-dimensional space, there is one crystal system, in 2D space, there are four crystal systems, oblique, rectangular, square and hexagonal. The relation between three-dimensional crystal families, crystal systems and lattice systems is shown in the table, Note. To avoid confusion of terminology, the term trigonal lattice is not used, if the original structure and inverted structure are identical, then the structure is centrosymmetric. Still, even for non-centrosymmetric case, inverted structure in some cases can be rotated to align with the original structure and this is the case of non-centrosymmetric achiral structure. If the inverted structure cannot be rotated to align with the structure, then the structure is chiral
5.
Dodecahedron
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In geometry, a dodecahedron is any polyhedron with twelve flat faces. The most familiar dodecahedron is the dodecahedron, which is a Platonic solid. There are also three regular star dodecahedra, which are constructed as stellations of the convex form, all of these have icosahedral symmetry, order 120. The pyritohedron is a pentagonal dodecahedron, having the same topology as the regular one. The rhombic dodecahedron, seen as a case of the pyritohedron has octahedral symmetry. The elongated dodecahedron and trapezo-rhombic dodecahedron variations, along with the rhombic dodecahedra are space-filling, there are a large number of other dodecahedra. The convex regular dodecahedron is one of the five regular Platonic solids, the dual polyhedron is the regular icosahedron, having five equilateral triangles around each vertex. Like the regular dodecahedron, it has twelve pentagonal faces. However, the pentagons are not constrained to be regular, and its 30 edges are divided into two sets – containing 24 and 6 edges of the same length. The only axes of symmetry are three mutually perpendicular twofold axes and four threefold axes. Note that the regular dodecahedron can occur as a shape for quasicrystals with icosahedral symmetry. Its name comes from one of the two common crystal habits shown by pyrite, the one being the cube. The coordinates of the eight vertices of the cube are, The coordinates of the 12 vertices of the cross-edges are. When h =1, the six cross-edges degenerate to points, when h =0, the cross-edges are absorbed in the facets of the cube, and the pyritohedron reduces to a cube. When h = √5 − 1/2, the inverse of the golden ratio, a reflected pyritohedron is made by swapping the nonzero coordinates above. The two pyritohedra can be superimposed to give the compound of two dodecahedra as seen in the image here, the regular dodecahedron represents a special intermediate case where all edges and angles are equal. A tetartoid is a dodecahedron with chiral tetrahedral symmetry, like the regular dodecahedron, it has twelve identical pentagonal faces, with three meeting in each of the 20 vertices. However, the pentagons are not regular and the figure has no fivefold symmetry axes, although regular dodecahedra do not exist in crystals, the tetartoid form does
6.
Blue
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Blue is the colour between violet and green on the optical spectrum of visible light. Human eyes perceive blue when observing light with a wavelength between 450 and 495 nanometres, which is between 4500 and 4950 ångströms. Blues with a frequency and thus a shorter wavelength gradually look more violet, while those with a lower frequency. Pure blue, in the middle, has a wavelength of 470 nanometers, in painting and traditional colour theory, blue is one of the three primary colours of pigments, along with red and yellow, which can be mixed to form a wide gamut of colours. Red and blue mixed together form violet, blue and yellow together form green, Blue is also a primary colour in the RGB colour model, used to create all the colours on the screen of a television or computer monitor. The clear sky and the sea appear blue because of an optical effect known as Rayleigh scattering. When sunlight passes through the atmosphere, the wavelengths are scattered more widely by the oxygen and nitrogen molecules. An optical effect called Tyndall scattering, similar to Rayleigh scattering, explains blue eyes, distant objects appear more blue because of another optical effect called atmospheric perspective. Blue has been used for art and decoration since ancient times and it is the most important color in Judaism. In the Middle Ages, cobalt blue was used to colour the stained glass windows of cathedrals, beginning in the 9th century, Chinese artists used cobalt to make fine blue and white porcelain. Blue dyes for clothing were made from woad in Europe and indigo in Asia, in 1828 a synthetic ultramarine pigment was developed, and synthetic blue dyes and pigments gradually replaced mineral pigments and vegetable dyes. Pierre-Auguste Renoir, Vincent van Gogh and other late 19th century painters used ultramarine and cobalt blue not just to depict nature, in the late 18th century and 19th century, blue became a popular colour for military uniforms and police uniforms. In the 20th century, because blue was associated with harmony, it was chosen as the colour of the flags of the United Nations. Surveys in the US and Europe show that blue is the colour most commonly associated with harmony, faithfulness, confidence, distance, infinity, the imagination, cold, and sometimes with sadness. In US and European public opinion polls it is the most popular colour, Blue is the colour of light between violet and green on the visible spectrum. Blues also vary in shade or tint, darker shades of blue contain black or grey, darker shades of blue include ultramarine, cobalt blue, navy blue, and Prussian blue, while lighter tints include sky blue, azure, and Egyptian blue. Today most blue pigments and dyes are made by a chemical process, the modern English word blue comes from Middle English bleu or blewe, from the Old French bleu, a word of Germanic origin, related to the Old High German word blao. In heraldry, the azure is used for blue
7.
Calcite
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Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate. The Mohs scale of hardness, based on scratch hardness comparison. Other polymorphs of calcium carbonate are the minerals aragonite and vaterite, aragonite will change to calcite at 380–470 °C, and vaterite is even less stable. Calcite is derived from the German Calcit, a term coined in the 19th century from the Latin word for lime and it is thus etymologically related to chalk. Calcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals, however, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, prisms, or various scalenohedra. Calcite exhibits several twinning types adding to the variety of observed forms and it may occur as fibrous, granular, lamellar, or compact. Cleavage is usually in three directions parallel to the rhombohedron form and its fracture is conchoidal, but difficult to obtain. It has a defining Mohs hardness of 3, a gravity of 2.71. Color is white or none, though shades of gray, red, orange, yellow, green, blue, violet, brown, calcite is transparent to opaque and may occasionally show phosphorescence or fluorescence. A transparent variety called Iceland spar is used for optical purposes, acute scalenohedral crystals are sometimes referred to as dogtooth spar while the rhombohedral form is sometimes referred to as nailhead spar. Single calcite crystals display an optical property called birefringence and this strong birefringence causes objects viewed through a clear piece of calcite to appear doubled. The birefringent effect was first described by the Danish scientist Rasmus Bartholin in 1669, at a wavelength of ~590 nm calcite has ordinary and extraordinary refractive indices of 1.658 and 1.486, respectively. Between 190 and 1700 nm, the refractive index varies roughly between 1.9 and 1.5, while the extraordinary refractive index varies between 1.6 and 1.4. Calcite, like most carbonates, will dissolve with most forms of acid, calcite can be either dissolved by groundwater or precipitated by groundwater, depending on several factors including the water temperature, pH, and dissolved ion concentrations. Although calcite is fairly insoluble in water, acidity can cause dissolution of calcite. Ambient carbon dioxide, due to its acidity, has a slight solubilizing effect on calcite, calcite exhibits an unusual characteristic called retrograde solubility in which it becomes less soluble in water as the temperature increases. When conditions are right for precipitation, calcite forms mineral coatings that cement the existing rock grains together or it can fill fractures. On a landscape scale, continued dissolution of calcium carbonate-rich rocks can lead to the expansion and eventual collapse of cave systems, high-grade optical calcite was used in World War II for gun sights, specifically in bomb sights and anti-aircraft weaponry
8.
Pyrite
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The mineral pyrite, or iron pyrite, also known as fools gold, is an iron sulfide with the chemical formula FeS2. This minerals metallic luster and pale brass-yellow hue give it a resemblance to gold. The color has led to the nicknames brass, brazzle. Pyrite is the most common of the sulfide minerals, the name pyrite is derived from the Greek πυρίτης, of fire or in fire, in turn from πύρ, fire. 1550, the term had become a term for all of the sulfide minerals. Pyrite is usually associated with other sulfides or oxides in quartz veins, sedimentary rock. Despite being nicknamed fools gold, pyrite is sometimes found in association with small quantities of gold, Gold and arsenic occur as a coupled substitution in the pyrite structure. In the Carlin–type gold deposits, arsenian pyrite contains up to 0.37 wt% gold, Pyrite has been used since classical times to manufacture copperas, that is, iron sulfate. Iron pyrite was heaped up and allowed to weather, the acidic runoff from the heap was then boiled with iron to produce iron sulfate. In the 15th century, such leaching began to replace the burning of sulfur as a source of sulfuric acid, by the 19th century, it had become the dominant method. Pyrite remains in use for the production of sulfur dioxide, for use in such applications as the paper industry. Thermal decomposition of pyrite into FeS and elemental sulfur starts at 540 °C, a newer commercial use for pyrite is as the cathode material in Energizer brand non-rechargeable lithium batteries. Pyrite is a material with a band gap of 0.95 eV. During the early years of the 20th century, pyrite was used as a detector in radio receivers. Pyrite detectors occupied a midway point between galena detectors and the more mechanically complicated perikon mineral pairs, Pyrite detectors can be as sensitive as a modern 1N34A germanium diode detector. Pyrite has been proposed as an abundant, inexpensive material in low-cost photovoltaic solar panels, synthetic iron sulfide was used with copper sulfide to create the photovoltaic material. Pyrite is used to make marcasite jewelry, marcasite jewelry, made from small faceted pieces of pyrite, often set in silver, was known since ancient times and was popular in the Victorian era. Marcasite jewelry does not actually contain the mineral marcasite, from the perspective of classical inorganic chemistry, which assigns formal oxidation states to each atom, pyrite is probably best described as Fe2+S22−
9.
Crystal habit
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In mineralogy, crystal habit is the characteristic external shape of an individual crystal or crystal group. A single crystals habit is a description of its shape and its crystallographic forms. Recognizing the habit may help in identifying a mineral, when the faces are well-developed due to uncrowded growth a crystal is called euhedral, one with partially developed faces is subhedral, and one with undeveloped crystal faces is called anhedral. The long axis of a quartz crystal typically has a six-sided prismatic habit with parallel opposite faces. Aggregates can be formed of individual crystals with euhedral to anhedral grains, the arrangement of crystals within the aggregate can be characteristic of certain minerals. For example, minerals used for asbestos insulation often grow in a fibrous habit, the terms used by mineralogists to report crystal habits describe the typical appearance of an ideal mineral. Recognizing the habit can aid in identification as some habits are characteristic, most minerals, however, do not display ideal habits due to conditions during crystallization. Minerals belonging to the crystal system do not necessarily exhibit the same habit. Some habits of a mineral are unique to its variety and locality, For example, while most sapphires form elongate barrel-shaped crystals, ordinarily, the latter habit is seen only in ruby. Sapphire and ruby are both varieties of the mineral, corundum. Some minerals may replace other existing minerals while preserving the originals habit, a classic example is tigers eye quartz, crocidolite asbestos replaced by silica. While quartz typically forms prismatic crystals, in tigers eye the original fibrous habit of crocidolite is preserved, the names of crystal habits are derived from, Predominant crystal faces. Abnormal grain growth Grain growth Crystallization
10.
Fracture (mineralogy)
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In the field of mineralogy, fracture is the texture and shape of a rocks surface formed when a mineral is fractured. Minerals often have a highly distinctive fracture, making it a feature used in their identification. Fracture differs from cleavage in that the latter involves clean splitting along the planes of the minerals crystal structure. All minerals exhibit fracture, but when very strong cleavage is present, conchoidal fracture breakage that resembles the concentric ripples of a mussel shell. It often occurs in amorphous or fine-grained minerals such as flint, opal or obsidian, subconchoidal fracture is similar to conchoidal fracture, but with less significant curvature. Earthy fracture is reminiscent of freshly broken soil and it is frequently seen in relatively soft, loosely bound minerals, such as limonite, kaolinite and aluminite. Hackly fracture is jagged, sharp and not even and it occurs when metals are torn, and so is often encountered in native metals such as copper and silver. Splintery fracture comprises sharp elongated points and it is particularly seen in fibrous minerals such as chrysotile, but may also occur in non-fibrous minerals such as kyanite. Uneven fracture is a surface or one with random irregularities. It occurs in a range of minerals including arsenopyrite, pyrite and magnetite. Rudolf Duda and Lubos Rejl, Minerals of the World http, //www. galleries. com/minerals/property/fracture. htm
11.
Mohs scale of mineral hardness
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The Mohs scale of mineral hardness is a qualitative ordinal scale characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material. Created in 1812 by German geologist and mineralogist Friedrich Mohs, it is one of several definitions of hardness in materials science, while greatly facilitating the identification of minerals in the field, the Mohs scale does not show how well hard materials perform in an industrial setting. Despite its lack of precision, the Mohs scale is highly relevant for field geologists, the Mohs scale hardness of minerals can be commonly found in reference sheets. Reference materials may be expected to have a uniform Mohs hardness, the Mohs scale of mineral hardness is based on the ability of one natural sample of mineral to scratch another mineral visibly. The samples of matter used by Mohs are all different minerals, Minerals are pure substances found in nature. Rocks are made up of one or more minerals, as the hardest known naturally occurring substance when the scale was designed, diamonds are at the top of the scale. The hardness of a material is measured against the scale by finding the hardest material that the material can scratch. For example, if material is scratched by apatite but not by fluorite. Scratching a material for the purposes of the Mohs scale means creating non-elastic dislocations visible to the naked eye, frequently, materials that are lower on the Mohs scale can create microscopic, non-elastic dislocations on materials that have a higher Mohs number. The Mohs scale is an ordinal scale. For example, corundum is twice as hard as topaz, the table below shows the comparison with the absolute hardness measured by a sclerometer, with pictorial examples. On the Mohs scale, a streak plate has a hardness of 7.0, using these ordinary materials of known hardness can be a simple way to approximate the position of a mineral on the scale. The table below incorporates additional substances that may fall between levels, Comparison between Hardness and Hardness, Mohs hardness of elements is taken from G. V, samsonov in Handbook of the physicochemical properties of the elements, IFI-Plenum, New York, USA,1968. The Hardness of Minerals and Rocks
12.
Lustre (mineralogy)
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Lustre or luster is the way light interacts with the surface of a crystal, rock, or mineral. The word traces its origins back to the latin lux, meaning light, a range of terms are used to describe lustre, such as earthy, metallic, greasy, and silky. Similarly, the term refers to a glassy lustre. A list of terms is given below. Lustre varies over a continuum, and so there are no rigid boundaries between the different types of lustre. The terms are frequently combined to describe types of lustre. Some minerals exhibit unusual optical phenomena, such as asterism or chatoyancy, a list of such phenomena is given below. Adamantine minerals possess a superlative lustre, which is most notably seen in diamond, such minerals are transparent or translucent, and have a high refractive index. Minerals with an adamantine lustre are uncommon, with examples being cerussite. Minerals with a degree of lustre are referred to as subadamantine, with some examples being garnet. Dull minerals exhibit little to no lustre, due to coarse granulations which scatter light in all directions, a distinction is sometimes drawn between dull minerals and earthy minerals, with the latter being coarser, and having even less lustre. Greasy minerals resemble fat or grease, a greasy lustre often occurs in minerals containing a great abundance of microscopic inclusions, with examples including opal and cordierite. Many minerals with a greasy lustre also feel greasy to the touch, metallic minerals have the lustre of polished metal, and with ideal surfaces will work as a reflective surface. Examples include galena, pyrite and magnetite, pearly minerals consist of thin transparent co-planar sheets. Light reflecting from these layers give them a lustre reminiscent of pearls, such minerals possess perfect cleavage, with examples including muscovite and stilbite. Resinous minerals have the appearance of resin, chewing gum or plastic, a principal example is amber, which is a form of fossilized resin. Silky minerals have an arrangement of extremely fine fibres, giving them a lustre reminiscent of silk. Examples include asbestos, ulexite and the satin spar variety of gypsum, a fibrous lustre is similar, but has a coarser texture
13.
Streak (mineralogy)
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The streak of a mineral is the color of the powder produced when it is dragged across an un-weathered surface. If no streak seems to be made, the streak is said to be white or colorless. Streak is particularly important as a diagnostic for opaque and colored materials and it is less useful for silicate minerals, most of which have a white streak or are too hard to powder easily. The apparent color of a mineral can vary widely because of impurities or a disturbed macroscopic crystal structure. Small amounts of an impurity that strongly absorbs a particular wavelength can radically change the wavelengths of light that are reflected by the specimen, and thus change the apparent color. However, when the specimen is dragged to produce a streak, it is broken into randomly oriented microscopic crystals, the surface across which the mineral is dragged is called a streak plate, and is generally made of unglazed porcelain tile. In the absence of a plate, the unglazed underside of a porcelain bowl or vase or the back of a glazed tile will work. Sometimes a streak is more easily or accurately described by comparing it with the streak made by another streak plate. Because the trail left behind results from the mineral being crushed into powder, in case of harder minerals, the color of the powder can be determined by filing or crushing with a hammer a small sample, which is then usually rubbed on a streak plate. Most minerals that are harder have a white streak. Some minerals leave a similar to their natural color, such as cinnabar. Other minerals leave surprising colors, such as fluorite, which always has a streak, although it can appear in purple, blue, yellow. Hematite, which is black in appearance, leaves a red streak which accounts for its name, galena, which can be similar in appearance to hematite, is easily distinguished by its gray streak. Hamilton, W. R. Cambridge Guide to Minerals, Rocks, the Encyclopedia of Gemstones and Minerals. New York, Facts on File. p.251, physical Characteristics of Minerals, at Introduction to Mineralogy by Andrea Bangert What is Streak
14.
Specific gravity
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This page is about the measurement using water as a reference. For a general use of gravity, see relative density. See intensive property for the property implied by specific, Apparent specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance. The reference substance is always water at its densest for liquids. Nonetheless, the temperature and pressure must be specified for both the sample and the reference, pressure is nearly always 1 atm. Temperatures for both sample and reference vary from industry to industry, in British beer brewing, the practice for specific gravity as specified above is to multiply it by 1000. Being a ratio of densities, specific gravity is a dimensionless quantity, Specific gravity varies with temperature and pressure, reference and sample must be compared at the same temperature and pressure or be corrected to a standard reference temperature and pressure. Substances with a gravity of 1 are neutrally buoyant in water. Those with SG greater than 1 are denser than water and will, disregarding surface tension effects and those with an SG less than 1 are less dense than water and will float on it. In scientific work, the relationship of mass to volume is expressed directly in terms of the density of the substance under study. It is in industry where specific gravity finds wide application, often for historical reasons. True specific gravity can be expressed mathematically as, S G true = ρ sample ρ H2 O where ρ sample is the density of the sample, the density of water varies with temperature and pressure as does the density of the sample. So it is necessary to specify the temperatures and pressures at which the densities or weights were determined and it is nearly always the case that measurements are made at 1 nominal atmosphere. For true specific gravity calculations, air pressure must be considered, temperatures are specified by the notation with T s representing the temperature at which the samples density was determined and T r the temperature at which the reference density is specified. For example, SG would be understood to mean that the density of the sample was determined at 20°C and of the water at 4°C. Taking into account different sample and reference temperatures, we note that, while S G H2 O =1.000000, it is also the case that S G H2 O =0.998203 /0.999840 =0.998363. Here, temperature is being specified using the current ITS-90 scale, on the previous IPTS-68 scale, the densities at 20 °C and 4 °C are 0.9982071 and 0.9999720 respectively, resulting in an SG value for water of 0.9982343. For example, in the industry, the Plato table lists sucrose concentration by weight against true SG
15.
Refractive index
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In optics, the refractive index or index of refraction n of a material is a dimensionless number that describes how light propagates through that medium. It is defined as n = c v, where c is the speed of light in vacuum, for example, the refractive index of water is 1.333, meaning that light travels 1.333 times faster in a vacuum than it does in water. The refractive index determines how light is bent, or refracted. The refractive indices also determine the amount of light that is reflected when reaching the interface, as well as the angle for total internal reflection. This implies that vacuum has a index of 1. The refractive index varies with the wavelength of light and this is called dispersion and causes the splitting of white light into its constituent colors in prisms and rainbows, and chromatic aberration in lenses. Light propagation in absorbing materials can be described using a refractive index. The imaginary part then handles the attenuation, while the real part accounts for refraction, the concept of refractive index is widely used within the full electromagnetic spectrum, from X-rays to radio waves. It can also be used with wave phenomena such as sound, in this case the speed of sound is used instead of that of light and a reference medium other than vacuum must be chosen. Thomas Young was presumably the person who first used, and invented, at the same time he changed this value of refractive power into a single number, instead of the traditional ratio of two numbers. The ratio had the disadvantage of different appearances, newton, who called it the proportion of the sines of incidence and refraction, wrote it as a ratio of two numbers, like 529 to 396. Hauksbee, who called it the ratio of refraction, wrote it as a ratio with a fixed numerator, hutton wrote it as a ratio with a fixed denominator, like 1.3358 to 1. Young did not use a symbol for the index of refraction, in the next years, others started using different symbols, n, m, and µ. For visible light most transparent media have refractive indices between 1 and 2, a few examples are given in the adjacent table. These values are measured at the yellow doublet D-line of sodium, with a wavelength of 589 nanometers, gases at atmospheric pressure have refractive indices close to 1 because of their low density. Almost all solids and liquids have refractive indices above 1.3, aerogel is a very low density solid that can be produced with refractive index in the range from 1.002 to 1.265. Moissanite lies at the end of the range with a refractive index as high as 2.65. Most plastics have refractive indices in the range from 1.3 to 1.7, for infrared light refractive indices can be considerably higher
16.
Gemstone
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A gemstone is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certain rocks or organic materials that are not minerals are used for jewelry and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone, apart from jewelry, from earliest antiquity engraved gems and hardstone carvings, such as cups, were major luxury art forms. A gem maker is called a lapidary or gemcutter, a worker is a diamantaire. The carvings of Carl Fabergé are significant works in this tradition, the traditional classification in the West, which goes back to the ancient Greeks, begins with a distinction between precious and semi-precious, similar distinctions are made in other cultures. In modern usage the precious stones are diamond, ruby, sapphire, other stones are classified by their color, translucency and hardness. Another unscientific term for semi-precious gemstones used in art history and archaeology is hardstone, in modern times gemstones are identified by gemologists, who describe gems and their characteristics using technical terminology specific to the field of gemology. The first characteristic a gemologist uses to identify a gemstone is its chemical composition, for example, diamonds are made of carbon and rubies of aluminium oxide. Next, many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic, another term used is habit, the form the gem is usually found in. For example, diamonds, which have a crystal system, are often found as octahedrons. Gemstones are classified into different groups, species, and varieties, for example, ruby is the red variety of the species corundum, while any other color of corundum is considered sapphire. Other examples are the Emerald, aquamarine, red beryl, goshenite, heliodor, and morganite, gems are characterized in terms of refractive index, dispersion, specific gravity, hardness, cleavage, fracture, and luster. They may exhibit pleochroism or double refraction and they may have luminescence and a distinctive absorption spectrum. Material or flaws within a stone may be present as inclusions, gemstones may also be classified in terms of their water. This is a grading of the gems luster, transparency. Very transparent gems are considered first water, while second or third water gems are those of a lesser transparency, there is no universally accepted grading system for gemstones. Diamonds are graded using a system developed by the Gemological Institute of America in the early 1950s, historically, all gemstones were graded using the naked eye
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Ancient history
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Ancient history is the aggregate of past events from the beginning of recorded human history and extending as far as the Early Middle Ages or the Postclassical Era. The span of recorded history is roughly 5,000 years, beginning with Sumerian Cuneiform script, the term classical antiquity is often used to refer to history in the Old World from the beginning of recorded Greek history in 776 BC. This roughly coincides with the date of the founding of Rome in 753 BC, the beginning of the history of ancient Rome. In India, ancient history includes the period of the Middle Kingdoms, and, in China. Historians have two major avenues which they take to better understand the ancient world, archaeology and the study of source texts, primary sources are those sources closest to the origin of the information or idea under study. Primary sources have been distinguished from secondary sources, which cite, comment on. Archaeology is the excavation and study of artefacts in an effort to interpret, archaeologists excavate the ruins of ancient cities looking for clues as to how the people of the time period lived. The study of the ancient cities of Harappa, Mohenjo-daro, the city of Pompeii, an ancient Roman city preserved by the eruption of a volcano in AD79. Its state of preservation is so great that it is a window into Roman culture and provided insight into the cultures of the Etruscans. The Terracotta Army, the mausoleum of the First Qin Emperor in ancient China, the discovery of Knossos by Minos Kalokairinos and Sir Arthur Evans. The discovery of Troy by Heinrich Schliemann, most of what is known of the ancient world comes from the accounts of antiquitys own historians. Although it is important to take account the bias of each ancient author. Some of the more notable ancient writers include Herodotus, Thucydides, Arrian, Plutarch, Polybius, Sima Qian, Sallust, Livy, Josephus, Suetonius, furthermore, the reliability of the information obtained from these surviving records must be considered. Few people were capable of writing histories, as literacy was not widespread in almost any culture until long after the end of ancient history, the earliest known systematic historical thought emerged in ancient Greece, beginning with Herodotus of Halicarnassus. He was also the first to distinguish between cause and immediate origins of an event, the Roman Empire was one of the ancient worlds most literate cultures, but many works by its most widely read historians are lost. Indeed, only a minority of the work of any major Roman historian has survived, prehistory is the period before written history. The early human migrations in the Lower Paleolithic saw Homo erectus spread across Eurasia 1.8 million years ago, the controlled use of fire occurred 800,000 years ago in the Middle Paleolithic. 250,000 years ago, Homo sapiens emerged in Africa, 60–70,000 years ago, Homo sapiens migrated out of Africa along a coastal route to South and Southeast Asia and reached Australia
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Sar-i Sang
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Sar-i Sang is a settlement in the Kuran Wa Munjan District of Badakhshan Province, Afghanistan, famous for its ancient lapis lazuli mines producing the worlds finest lapis. Sar-i Sang lapis lazuli mine probably dates from proto-historic times and it consists of one old disused shaft and two new shafts. This was the source of lapis lazuli in the ancient world, with lapis from here occurring in such famous archaeological discoveries as the Royal Treasure of Ur. Lapis lazuli Mount Imeon Warwick Ball,2008, The Monuments of Afghanistan, History, Archaeology and Architecture,261, Warwick Ball,1982, Archaeological Gazetteer of Afghanistan, Volume I,1001
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Shortugai
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Shortugai was an Indus civilization trading colony established around 2000 BC on the Oxus river near the lapis mines in northern Afghanistan. According to Sergent, not one of the characteristics of the Harappan cultural complex is missing from it. The town consists of two hills called A and B by the excavators, one of them was once the town proper, the other one the citadel. Each of them is about 2 hectares large, typical finds of the Indus Valley Civilization include one seal with a short inscription, clay models of cattle with carts and painted pottery. Pottery with Harappan design, jars, beakers, bronze objects, gold pieces, lapis lazuli beads, other types of beads, drill heads, square seals with animal motiff and script confirms this as a site belonging to Indus Valley Civilisation. A ploughed field with flax seeds in this site indicate dry land farming, shortugai was a trading post of Harappan times and it seems to be connected with lapis lazuli mines located in the surrounding area. It also might have connections with tin trade and camel trade, henri-Paul Francfort, Fouilles de Shortughai, Recherches sur LAsie Centrale Protohistorique Paris, Diffusion de Boccard,1989
20.
Badakhshan
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Badakhshan is a historic region comprising parts of what is now northeastern Afghanistan and southeastern Tajikistan. The name is retained in Badakhshan Province, which is one of the 34 provinces of Afghanistan and is located in North-East Afghanistan, much of historic Badakhshan lies within Tajikistans Gorno-Badakhshan Autonomous Region located in the south-eastern part of the country. The music of Badakhshan is an important part of the cultural heritage. Badakhshan has a diverse ethno-linguistic and religious community, tajiks and Pamiris are the majority while a tiny minority of Kyrgyzs and Uzbeks also are found in their own villages. There are also groups of speakers of several Pamir languages of the Eastern Iranian language group, during the 20th century within Gorno-Badakhshan Autonomous Region in Tajikistan the speakers of Pamir languages formed their own separate ethnic identity as Pamiris. The Pamiri people were not officially recognized as an ethnic group in Tajikistan. The main religions of Badakhshan are Ismaili Islam and Sunni Islam, the people of this province have a rich cultural heritage and they have preserved unique ancient forms of music, poetry and dance. Badakhshan was an important trading center during antiquity, lapis lazuli was traded exclusively from there as early as the second half of the 4th millennium BC. Badakhshan was an important region when the Silk Road passed through and its significance is its geo-economic role in trades of silk and ancient commodities transactions between the East and West. According to Marco Polo, Badashan/ Badakshan was a province where Balas ruby could be found under the mountain Syghinan, the region was ruled over by the mirs of Badakhshan. Sultan Muhammad of Badakhshan was the last of a series of kings who traced their descent to Alexander the Great, when Mahmud died, Amir Khusroe Khan, one of his nobles, blinded Baysinghar Mirza, killed the second prince, and ruled as usurper. He submitted to Mughal Emperor Babur in 1504 CE, when Babur took Kandahar in 1506 CE, from Shah Beg Arghun, he sent Khan Mirza as governor to Badakhshan. A son was born to Khan Mirza by the name of Mirza Sulaiman in 1514 CE and they were released by Emperor Humayun in 1545, and took again possession of Badakhshan. Bent on making conquests, he invaded Balkh in 1560, but had to return and his son, Mirza Ibrahim, was killed in battle. When Akbar became Mughal Emperor, his stepbrother Mirza Muhammad Hakims mother had killed by Shah Abul Maali. He returned to Kabul in 1566, when Akbars troops had left that country, Mirza Sulaimans wife was Khurram Begum, of the Kipchak tribe. She was clever and had her husband so much in her power and her enemy was Muhtarim Khanum, the widow of Prince Kamran Mirza. Mirza Sulaiman wanted to marry her, but Khurram Begum got her married, against her will, to Mirza Ibrahim, by whom she had a son, Mirza Shahrukh
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Afghanistan
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Afghanistan, officially the Islamic Republic of Afghanistan, is a landlocked country located within South Asia and Central Asia. It has a population of approximately 32 million, making it the 42nd most populous country in the world. It is bordered by Pakistan in the south and east, Iran in the west, Turkmenistan, Uzbekistan, and Tajikistan in the north and its territory covers 652,000 km2, making it the 41st largest country in the world. The land also served as the source from which the Kushans, Hephthalites, Samanids, Saffarids, Ghaznavids, Ghorids, Khiljis, Mughals, Hotaks, Durranis, the political history of the modern state of Afghanistan began with the Hotak and Durrani dynasties in the 18th century. In the late 19th century, Afghanistan became a state in the Great Game between British India and the Russian Empire. Following the Third Anglo-Afghan War in 1919, King Amanullah unsuccessfully attempted to modernize the country and it remained peaceful during Zahir Shahs forty years of monarchy. A series of coups in the 1970s was followed by a series of wars that devastated much of Afghanistan. The name Afghānistān is believed to be as old as the ethnonym Afghan, the root name Afghan was used historically in reference to a member of the ethnic Pashtuns, and the suffix -stan means place of in Persian. Therefore, Afghanistan translates to land of the Afghans or, more specifically in a historical sense, however, the modern Constitution of Afghanistan states that he word Afghan shall apply to every citizen of Afghanistan. An important site of historical activities, many believe that Afghanistan compares to Egypt in terms of the historical value of its archaeological sites. The country sits at a unique nexus point where numerous civilizations have interacted and it has been home to various peoples through the ages, among them the ancient Iranian peoples who established the dominant role of Indo-Iranian languages in the region. At multiple points, the land has been incorporated within large regional empires, among them the Achaemenid Empire, the Macedonian Empire, the Indian Maurya Empire, and the Islamic Empire. Archaeological exploration done in the 20th century suggests that the area of Afghanistan has been closely connected by culture and trade with its neighbors to the east, west. Artifacts typical of the Paleolithic, Mesolithic, Neolithic, Bronze, urban civilization is believed to have begun as early as 3000 BCE, and the early city of Mundigak may have been a colony of the nearby Indus Valley Civilization. More recent findings established that the Indus Valley Civilisation stretched up towards modern-day Afghanistan, making the ancient civilisation today part of Pakistan, Afghanistan, in more detail, it extended from what today is northwest Pakistan to northwest India and northeast Afghanistan. An Indus Valley site has found on the Oxus River at Shortugai in northern Afghanistan. There are several smaller IVC colonies to be found in Afghanistan as well, after 2000 BCE, successive waves of semi-nomadic people from Central Asia began moving south into Afghanistan, among them were many Indo-European-speaking Indo-Iranians. These tribes later migrated further into South Asia, Western Asia, the region at the time was referred to as Ariana
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Indus Valley Civilisation
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The Indus Valley Civilisation was a Bronze Age civilisation mainly in the northwestern regions of South Asia, extending from what today is northeast Afghanistan to Pakistan and northwest India. Along with ancient Egypt and Mesopotamia it was one of three early civilisations of the Old World, and of the three, the most widespread, at its peak, the Indus Civilisation may have had a population of over five million. Inhabitants of the ancient Indus river valley developed new techniques in handicraft, the Indus cities are noted for their urban planning, baked brick houses, elaborate drainage systems, water supply systems, and clusters of large non-residential buildings. The discovery of Harappa, and soon afterwards, Mohenjo-Daro, was the culmination of work beginning in 1861 with the founding of the Archaeological Survey of India in the British Raj, excavation of Harappan sites has been ongoing since 1920, with important breakthroughs occurring as recently as 1999. This Harappan civilisation is called the Mature Harappan culture to distinguish it from the cultures immediately preceding and following it. The early Harappan cultures were preceded by local Neolithic agricultural villages, as of 1999, over 1,056 cities and settlements had been found, of which 96 have been excavated, mainly in the general region of the Indus and Ghaggar-Hakra Rivers and their tributaries. Among the settlements were the urban centres of Harappa, Mohenjo-daro, Dholavira, Ganeriwala in Cholistan. The Harappan language is not directly attested and its affiliation is uncertain since the Indus script is still undeciphered, a relationship with the Dravidian or Elamo-Dravidian language family is favoured by a section of scholars. Recently, Indus sites have been discovered in Pakistans northwestern Frontier Province as well, other IVC colonies can be found in Afghanistan while smaller isolated colonies can be found as far away as Turkmenistan and in Maharashtra. The largest number of colonies are in the Punjab, Sindh, Rajasthan, Haryana, Indus Valley sites have been found most often on rivers, but also on the ancient seacoast, for example, Balakot, and on islands, for example, Dholavira. There is evidence of dry river beds overlapping with the Hakra channel in Pakistan, many Indus Valley sites have been discovered along the Ghaggar-Hakra beds. Among them are, Rupar, Rakhigarhi, Sothi, Kalibangan, Harappan Civilisation remains the correct one, according to the common archaeological usage of naming a civilisation after its first findspot. John wrote, I was much exercised in my mind how we were to get ballast for the line of the railway and they were told of an ancient ruined city near the lines, called Brahminabad. Visiting the city, he found it full of hard well-burnt bricks, and, convinced there was a grand quarry for the ballast I wanted. These bricks now provided ballast along 93 miles of the track running from Karachi to Lahore. In 1872–75, Alexander Cunningham published the first Harappan seal and it was half a century later, in 1912, that more Harappan seals were discovered by J. J. H. MacKay, and Marshall. By 1931, much of Mohenjo-Daro had been excavated, but excavations continued, such as that led by Sir Mortimer Wheeler, director of the Archaeological Survey of India in 1944. Among other archaeologists who worked on IVC sites before the independence in 1947 were Ahmad Hasan Dani, Brij Basi Lal, Nani Gopal Majumdar, and Sir Marc Aurel Stein
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Neolithic
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It ended when metal tools became widespread. The Neolithic is a progression of behavioral and cultural characteristics and changes, including the use of wild and domestic crops, the beginning of the Neolithic culture is considered to be in the Levant about 10, 200–8800 BC. It developed directly from the Epipaleolithic Natufian culture in the region, whose people pioneered the use of wild cereals, which then evolved into true farming. The Natufian period was between 12,000 and 10,200 BC, and the so-called proto-Neolithic is now included in the Pre-Pottery Neolithic between 10,200 and 8800 BC. By 10, 200–8800 BC, farming communities arose in the Levant and spread to Asia Minor, North Africa, Mesopotamia is the site of the earliest developments of the Neolithic Revolution from around 10,000 BC. Early Neolithic farming was limited to a range of plants, both wild and domesticated, which included einkorn wheat, millet and spelt, and the keeping of dogs, sheep. By about 6900–6400 BC, it included domesticated cattle and pigs, the establishment of permanently or seasonally inhabited settlements, not all of these cultural elements characteristic of the Neolithic appeared everywhere in the same order, the earliest farming societies in the Near East did not use pottery. Early Japanese societies and other East Asian cultures used pottery before developing agriculture, unlike the Paleolithic, when more than one human species existed, only one human species reached the Neolithic. The term Neolithic derives from the Greek νέος néos, new and λίθος líthos, stone, the term was invented by Sir John Lubbock in 1865 as a refinement of the three-age system. In the Middle East, cultures identified as Neolithic began appearing in the 10th millennium BC, early development occurred in the Levant and from there spread eastwards and westwards. Neolithic cultures are attested in southeastern Anatolia and northern Mesopotamia by around 8000 BC. The total excavated area is more than 1,200 square yards, the Neolithic 1 period began roughly 10,000 years ago in the Levant. A temple area in southeastern Turkey at Göbekli Tepe dated around 9500 BC may be regarded as the beginning of the period. This site was developed by nomadic tribes, evidenced by the lack of permanent housing in the vicinity. At least seven stone circles, covering 25 acres, contain limestone pillars carved with animals, insects, Stone tools were used by perhaps as many as hundreds of people to create the pillars, which might have supported roofs. Other early PPNA sites dating to around 9500–9000 BC have been found in Jericho, Israel, Gilgal in the Jordan Valley, the start of Neolithic 1 overlaps the Tahunian and Heavy Neolithic periods to some degree. The major advance of Neolithic 1 was true farming, in the proto-Neolithic Natufian cultures, wild cereals were harvested, and perhaps early seed selection and re-seeding occurred. The grain was ground into flour, emmer wheat was domesticated, and animals were herded and domesticated
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Mehrgarh
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Mehrgarh, sometimes anglicized as Mehergarh or Mehrgar, is a Neolithic site located near the Bolan Pass on the Kacchi Plain of Balochistan, Pakistan, to the west of the Indus River valley. The earliest settlement at Mehrgarh, in the northeast corner of the 495-acre site, was a farming village which was inhabited from circa 6500 BCE. It is one of the earliest sites with evidence of farming and herding in South Asia, archaeological material has been found in six mounds, and about 32,000 artifacts have been collected. Mehrgarh is now seen as a precursor to the Indus Valley Civilization, displaying the whole sequence from earliest settlement, jean-Francois Jarrige argues for an independent origin of Mehrgarh. But given the originality of Mehrgarh, Jarrige concludes that Mehrgarh has a local background. Gallego Romero notes that Indians who are lactose-tolerant show a genetic pattern regarding this tolerance which is characteristic of the common European mutation. According to Romero, this suggests that the most common lactose tolerance mutation made a migration out of the Middle East less than 10,000 years ago. They further note that he earliest evidence of cattle herding in south Asia comes from the Indus River Valley site of Mehrgarh and is dated to 7,000 YBP, Archaeologists divide the occupation at the site into eight periods. The Mehrgarh Period I was Neolithic and aceramic, without the use of pottery, the earliest farming in the area was developed by semi-nomadic people using plants such as wheat and barley and animals such as sheep, goats and cattle. The settlement was established with simple mud buildings and most of them had four internal subdivisions, ornaments of sea shell, limestone, turquoise, lapis lazuli and sandstone have been found, along with simple figurines of women and animals. Sea shells from far sea shore and lapis lazuli found as far away as present-day Badakshan, Afghanistan shows good contact with those areas, a single ground stone axe was discovered in a burial, and several more were obtained from the surface. These ground stone axes are the earliest to come from a context in the South Asia. Periods I, II and III are contemporaneous with another site called Kili Gul Mohammed, in April 2006, it was announced in the scientific journal Nature that the oldest evidence for the drilling of human teeth in vivo was found in Mehrgarh. According to the authors, their discoveries point to a tradition of proto-dentistry in the farming cultures of that region. Here we describe eleven drilled molar crowns from nine adults discovered in a Neolithic graveyard in Pakistan that dates from 7,500 to 9,000 years ago and these findings provide evidence for a long tradition of a type of proto-dentistry in an early farming culture. The Mehrgarh Period II and Merhgarh Period III were ceramic Neolithic, using pottery, Period II is at site MR4 and Period III is at MR2. Much evidence of manufacturing activity has been found and more advanced techniques were used, glazed faience beads were produced and terracotta figurines became more detailed. Figurines of females were decorated with paint and had diverse hairstyles, two flexed burials were found in Period II with a red ochre cover on the body
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Caucasus
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The Caucasus /ˈkɔːkəsəs/ or Caucasia /kɔːˈkeɪʒə/ is a region at the border of Europe and Asia, situated between the Black and the Caspian seas. It is home to the Caucasus Mountains, which contain Europes highest mountain, politically, the Caucasus region is separated between northern and southern parts. The southern parts consist of independent sovereign states, and the parts are under the jurisdiction of the Russian Federation. The region is known for its diversity, aside from Indo-European and Turkic languages, the Kartvelian, Northwest Caucasian. Pliny the Elders Natural History derives the name of the Caucasus from Scythian kroy-khasis, German linguist Paul Kretschmer notes that the Latvian word Kruvesis also means ice. According to German philologists Otto Schrader and Alfons A. Nehring, the South Caucasus region and southern Dagestan were the furthest points of Persian expansions, with areas to the north of Caucasus Mountains practically impregnable. The mythological mountain of Qaf, the worlds highest mountain that ancient lore shrouded in mystery, was said to be situated in this region, therefore, the Caucasus might be associated with the legendary mountain. The Ciscaucasus contains the majority of the Greater Caucasus Mountain range. It includes Southwestern Russia and northern parts of Georgia and Azerbaijan, the Transcaucasus is bordered on the north by Russia, on the west by the Black Sea and Turkey, on the east by the Caspian Sea, and on the south by Iran. It includes the Caucasus Mountains and surrounding lowlands, all of Armenia, Azerbaijan and Georgia are in South Caucasus. The main Greater Caucasus range is generally perceived to be the line between Asia and Europe. The highest peak in the Caucasus is Mount Elbrus in the western Ciscaucasus in Russia, the Caucasus is one of the most linguistically and culturally diverse regions on Earth. The nation states that comprise the Caucasus today are the post-Soviet states Georgia, Armenia, three territories in the region claim independence but are recognized as such by only a handful or by no independent states, Nagorno-Karabakh, Abkhazia and South Ossetia. Abkhazia and South Ossetia are recognised by the majority of independent states as part of Georgia, the Russian divisions include Krasnodar Krai, Stavropol Krai, and the autonomous republics of Adygea, Karachay–Cherkessia, Kabardino-Balkaria, North Ossetia, Ingushetia, Chechnya, and Dagestan. The region has many different languages and language families, there are more than 50 ethnic groups living in the region. Russian is used as a common language, today the peoples of the Northern and Southern Caucasus tend to be either Eastern Orthodox Christians, Oriental Orthodox Christians, or Sunni Muslims. Shia Islam has had many adherents historically in Azerbaijan, located in the part of the region. Located on the peripheries of Turkey, Iran, and Russia, the region has been an arena for political, military, religious, throughout its history, the Caucasus was usually incorporated into the Iranian world
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Mauritania
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Mauritania /mɔːrɪˈteɪniə/, officially the Islamic Republic of Mauritania, is a country in the Maghreb region of western Africa. The country derives its name from the ancient Berber Kingdom of Mauretania, approximately 90% of Mauritanias land is within the Sahara and consequently the population is concentrated in the south, where precipitation is slightly higher. The capital and largest city is Nouakchott, located on the Atlantic coast, the government was overthrown on 6 August 2008, in a military coup détat led by General Mohamed Ould Abdel Aziz. On 16 April 2009, Aziz resigned from the military to run for president in the 19 July elections, about 20% of Mauritanians live on less than US$1.25 per day. Mauritania suffers from several human rights issues, including slavery, as at least 4% of the population are enslaved against their will, the Bafours were primarily agriculturalist, and among the first Saharan people to abandon their historically nomadic lifestyle. With the gradual desiccation of the Sahara, they headed south, many of the Berber tribes claimed Yemeni origins. There is little evidence to such claims, but a 2000 DNA study of Yemeni people suggested there might be some ancient connection between the peoples. Other peoples also migrated south past the Sahara to West Africa, in 1076, Moorish Islamic warrior monks attacked and conquered the large area of the ancient Ghana Empire. Over the next 500 years, Arabs overcame fierce resistance from the population to dominate Mauritania. The Char Bouba war was the final effort of the peoples to repel the Yemeni Maqil Arab invaders. The invaders were led by the Beni Hassan tribe, the descendants of the Beni Hassan warriors became the upper stratum of Moorish society. Hassaniya, a Berber-influenced Arabic dialect that derives its name from the Beni Hassan, berbers retained a niche influence by producing the majority of the regions marabouts, those who preserve and teach Islamic tradition. Imperial France gradually absorbed the territories of present-day Mauritania from the Senegal River area and upwards, in 1901, Xavier Coppolani took charge of the imperial mission. Through a combination of strategic alliances with Zawiya tribes, and military pressure on the Hassane warrior nomads, he managed to extend French rule over the Mauritanian emirates. Trarza, Brakna and Tagant quickly submitted to treaties with the colonial power, Adrar was finally defeated militarily in 1912, and incorporated into the territory of Mauritania, which had been drawn up and planned in 1904. Mauritania was part of French West Africa from 1920, French rule brought legal prohibitions against slavery and an end to inter-clan warfare. During the colonial period, 90% of the population remained nomadic, many sedentary peoples, whose ancestors had been expelled centuries earlier, began to trickle back into Mauritania. After gaining independence, larger numbers of indigenous Sub-Saharan African peoples entered Mauritania, educated in French language and customs, many of these recent arrivals became clerks, soldiers, and administrators in the new state
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Tutankhamun's mask
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Tutankhamuns mask, is funerary mask of Tutankhamun, is the death mask of the 18th-dynasty Ancient Egyptian Pharaoh Tutankhamun. It was discovered by Howard Carter in 1925 in tomb KV62 and is now housed in the Egyptian Museum in Cairo, the mask is one of the most well known works of art in the world. According to the Egyptologist Nicholas Reeves, the mask is not only the image from Tutankhamuns tomb. Since 2001, research has suggested that it may originally have been intended for Queen Neferneferuaten, Tutankhamuns burial chamber was found in the Valley of the Kings in the Theban Necropolis in 1922 and opened 3 years later. It would be two years before the excavation team, led by the English archaeologist Howard Carter, was able to open the heavy sarcophagus containing Tutankhamuns mummy. On 28 October 1925, they opened the innermost of three coffins to reveal the gold mask, seen by people for the first time in approximately 3,250 years. Carter wrote in his diary, The pins removed, the lid was raised. Ankh. Amen – placid and beautiful, with the features as we find upon his statues. The mask has fallen back, thus its gaze is straight up to the heavens. In December 1925, the mask was removed from the tomb, placed in a crate and transported 635 kilometres to the Egyptian Museum in Cairo, the mask is 54 cm tall,39.3 cm wide and 49 cm deep. It is fashioned from two layers of gold, varying from 1. 5–3 mm in thickness, and weighing 10.23 kg. X-ray crystallography has revealed that the mask contains two alloys of gold, a lighter 18.4 karat shade for the face and neck, and 22.5 karat gold for the rest of the mask. The face represents the standard image, and the same image was found by excavators elsewhere in the tomb. He wears a nemes headcloth, topped by the insignia of a cobra and vulture. The ears are pierced to hold earrings, a feature that appears to have reserved for queens. It contains inlays of coloured glass and gemstones, including lapis lazuli, quartz, obsidian, carnelian, feldspar, turquoise, amazonite, faience, in August 2014, the beard fell off when the mask was taken out of its display case for cleaning. The museum workers responsible used quick-drying epoxy in an attempt to fix it, the damage was noticed in January 2015, and has been repaired by a German-Egyptian team who reattached it using beeswax, a natural material used by the ancient Egyptians. A former director of the museum and a director of restoration were among those facing prosecution. A protective spell is inscribed with Egyptian hieroglyphs on the back and shoulders in ten vertical, the inscription is from Chapter 151 of the Book of the Dead and first appeared on masks in the Middle Kingdom,500 years before Tutankhamun
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Middle Ages
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In the history of Europe, the Middle Ages or Medieval Period lasted from the 5th to the 15th century. It began with the fall of the Western Roman Empire and merged into the Renaissance, the Middle Ages is the middle period of the three traditional divisions of Western history, classical antiquity, the medieval period, and the modern period. The medieval period is subdivided into the Early, High. Population decline, counterurbanisation, invasion, and movement of peoples, the large-scale movements of the Migration Period, including various Germanic peoples, formed new kingdoms in what remained of the Western Roman Empire. In the seventh century, North Africa and the Middle East—once part of the Byzantine Empire—came under the rule of the Umayyad Caliphate, although there were substantial changes in society and political structures, the break with classical antiquity was not complete. The still-sizeable Byzantine Empire survived in the east and remained a major power, the empires law code, the Corpus Juris Civilis or Code of Justinian, was rediscovered in Northern Italy in 1070 and became widely admired later in the Middle Ages. In the West, most kingdoms incorporated the few extant Roman institutions, monasteries were founded as campaigns to Christianise pagan Europe continued. The Franks, under the Carolingian dynasty, briefly established the Carolingian Empire during the later 8th, the Crusades, first preached in 1095, were military attempts by Western European Christians to regain control of the Holy Land from Muslims. Kings became the heads of centralised nation states, reducing crime and violence, intellectual life was marked by scholasticism, a philosophy that emphasised joining faith to reason, and by the founding of universities. Controversy, heresy, and the Western Schism within the Catholic Church paralleled the conflict, civil strife. Cultural and technological developments transformed European society, concluding the Late Middle Ages, the Middle Ages is one of the three major periods in the most enduring scheme for analysing European history, classical civilisation, or Antiquity, the Middle Ages, and the Modern Period. Medieval writers divided history into periods such as the Six Ages or the Four Empires, when referring to their own times, they spoke of them as being modern. In the 1330s, the humanist and poet Petrarch referred to pre-Christian times as antiqua, leonardo Bruni was the first historian to use tripartite periodisation in his History of the Florentine People. Bruni and later argued that Italy had recovered since Petrarchs time. The Middle Ages first appears in Latin in 1469 as media tempestas or middle season, in early usage, there were many variants, including medium aevum, or middle age, first recorded in 1604, and media saecula, or middle ages, first recorded in 1625. The alternative term medieval derives from medium aevum, tripartite periodisation became standard after the German 17th-century historian Christoph Cellarius divided history into three periods, Ancient, Medieval, and Modern. The most commonly given starting point for the Middle Ages is 476, for Europe as a whole,1500 is often considered to be the end of the Middle Ages, but there is no universally agreed upon end date. English historians often use the Battle of Bosworth Field in 1485 to mark the end of the period
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Ultramarine
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Ultramarine is a deep blue color and a pigment which was originally made by grinding lapis lazuli into a powder. The name comes from the Latin ultramarinus, literally beyond the sea, Ultramarine was the finest and most expensive blue used by Renaissance painters. It was often used for the robes of the Virgin Mary and it remained an extremely expensive pigment until a synthetic ultramarine was invented in 1826. The pigment consists primarily of a mineral containing small amounts of polysulfides. It occurs in nature as a component of lapis lazuli containing a blue cubic mineral called lazurite. The pigment color code is P, the major component of lazurite is a complex sulfur-containing sodium-silicate, which makes ultramarine the most complex of all mineral pigments. Some chloride is present in the crystal lattice as well. The blue color of the pigment is due to the S−3 radical anion, the preparation is typically made in steps. The first part of the takes place at 700 to 750 °C in a closed furnace, so that sulphur, carbon. This yields a yellow-green product sometimes used as a pigment, in the second step air or sulphur dioxide at 350 to 450 °C is used to oxidise sulphide sulphur in the intermediate product to S2 and Sn chromophore molecules, resulting in the blue pigment. The mixture is heated in a kiln, sometimes in brick-sized amounts, the resultant solids are then ground and washed as per any other insoluble pigment manufacturing process. The chemical reaction produces large amounts of sulfur dioxide, meaning that flue-gas desulfurization is an part of its manufacture to comply with pollution regulations. Large chimneys were used to disperse sulfur dioxide produced in the process, resulting in ultramarine tinting the surrounding ground surfaces, Ultramarine poor in silica is obtained by fusing a mixture of soft clay, sodium sulfate, charcoal, sodium carbonate and sulfur. The product is at first white, but soon turns green green ultramarine when it is mixed with sulfur, the sulfur burns, and a fine blue pigment is obtained. Ultramarine rich in silica is obtained by heating a mixture of pure clay, very fine white sand, sulfur. A blue product is obtained at once, but a red tinge often results, the different ultramarines—green, blue, red and violet—are finely ground and washed with water. Its color is unaffected by light nor by contact with oil or lime as used in painting, hydrochloric acid immediately bleaches it with liberation of hydrogen sulfide. Even a small addition of oxide to the reddish varieties especially causes a considerable diminution in the intensity of the color
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Pigment
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A pigment is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption. This physical process differs from fluorescence, phosphorescence, and other forms of luminescence, many materials selectively absorb certain wavelengths of light. Materials that humans have chosen and developed for use as pigments usually have properties that make them ideal for coloring other materials. A pigment must have a high tinting strength relative to the materials it colors and it must be stable in solid form at ambient temperatures. For industrial applications, as well as in the arts, permanence, pigments that are not permanent are called fugitive. Fugitive pigments fade over time, or with exposure to light, pigments are used for coloring paint, ink, plastic, fabric, cosmetics, food, and other materials. Most pigments used in manufacturing and the arts are dry colorants. This powder is added to a binder, a neutral or colorless material that suspends the pigment. A distinction is made between a pigment, which is insoluble in its vehicle, and a dye, which either is itself a liquid or is soluble in its vehicle. A colorant can act as either a pigment or a dye depending on the vehicle involved, in some cases, a pigment can be manufactured from a dye by precipitating a soluble dye with a metallic salt. The resulting pigment is called a lake pigment, the term biological pigment is used for all colored substances independent of their solubility. In 2006, around 7.4 million tons of inorganic, organic, asia has the highest rate on a quantity basis followed by Europe and North America. By 2020, revenues will have risen to approx, the global demand on pigments was roughly US$20.5 billion in 2009, around 1. 5-2% up from the previous year. It is predicted to increase in a growth rate in the coming years. The worldwide sales are said to increase up to US$24.5 billion in 2015, pigments appear the colors they are because they selectively reflect and absorb certain wavelengths of visible light. White light is an equal mixture of the entire spectrum of visible light with a wavelength in a range from about 375 or 400 nanometers to about 760 or 780 nm. When this light encounters a pigment, parts of the spectrum are absorbed by the molecules or ions of the pigment, in organic pigments such as diazo or phthalocyanine compounds the light is absorbed by the conjugated systems of double bonds in the molecule. Some of the inorganic pigments such as vermilion or cadmium yellow absorb light by transferring an electron from the ion to the positive ion
31.
Renaissance
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The Renaissance was a period in European history, from the 14th to the 17th century, regarded as the cultural bridge between the Middle Ages and modern history. It started as a movement in Italy in the Late Medieval period and later spread to the rest of Europe. This new thinking became manifest in art, architecture, politics, science, Early examples were the development of perspective in oil painting and the recycled knowledge of how to make concrete. Although the invention of movable type sped the dissemination of ideas from the later 15th century. In politics, the Renaissance contributed to the development of the customs and conventions of diplomacy, the Renaissance began in Florence, in the 14th century. Other major centres were northern Italian city-states such as Venice, Genoa, Milan, Bologna, the word Renaissance, literally meaning Rebirth in French, first appeared in English in the 1830s. The word also occurs in Jules Michelets 1855 work, Histoire de France, the word Renaissance has also been extended to other historical and cultural movements, such as the Carolingian Renaissance and the Renaissance of the 12th century. The Renaissance was a movement that profoundly affected European intellectual life in the early modern period. Renaissance scholars employed the humanist method in study, and searched for realism, however, a subtle shift took place in the way that intellectuals approached religion that was reflected in many other areas of cultural life. In addition, many Greek Christian works, including the Greek New Testament, were back from Byzantium to Western Europe. Political philosophers, most famously Niccolò Machiavelli, sought to describe life as it really was. Others see more competition between artists and polymaths such as Brunelleschi, Ghiberti, Donatello, and Masaccio for artistic commissions as sparking the creativity of the Renaissance. Yet it remains much debated why the Renaissance began in Italy, accordingly, several theories have been put forward to explain its origins. During the Renaissance, money and art went hand in hand, Artists depended entirely on patrons while the patrons needed money to foster artistic talent. Wealth was brought to Italy in the 14th, 15th, and 16th centuries by expanding trade into Asia, silver mining in Tyrol increased the flow of money. Luxuries from the Eastern world, brought home during the Crusades, increased the prosperity of Genoa, unlike with Latin texts, which had been preserved and studied in Western Europe since late antiquity, the study of ancient Greek texts was very limited in medieval Western Europe. One of the greatest achievements of Renaissance scholars was to bring this entire class of Greek cultural works back into Western Europe for the first time since late antiquity, Arab logicians had inherited Greek ideas after they had invaded and conquered Egypt and the Levant. Their translations and commentaries on these ideas worked their way through the Arab West into Spain and Sicily and this work of translation from Islamic culture, though largely unplanned and disorganized, constituted one of the greatest transmissions of ideas in history
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Baroque
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The style began around 1600 in Rome and Italy, and spread to most of Europe. The aristocracy viewed the dramatic style of Baroque art and architecture as a means of impressing visitors by projecting triumph, power, Baroque palaces are built around an entrance of courts, grand staircases, and reception rooms of sequentially increasing opulence. However, baroque has a resonance and application that extend beyond a reduction to either a style or period. It is also yields the Italian barocco and modern Spanish barroco, German Barock, Dutch Barok, others derive it from the mnemonic term Baroco, a supposedly laboured form of syllogism in logical Scholastica. The Latin root can be found in bis-roca, in informal usage, the word baroque can simply mean that something is elaborate, with many details, without reference to the Baroque styles of the 17th and 18th centuries. The word Baroque, like most periodic or stylistic designations, was invented by later critics rather than practitioners of the arts in the 17th, the term Baroque was initially used in a derogatory sense, to underline the excesses of its emphasis. In particular, the term was used to describe its eccentric redundancy and noisy abundance of details, although it was long thought that the word as a critical term was first applied to architecture, in fact it appears earlier in reference to music. Another hypothesis says that the word comes from precursors of the style, Giacomo Barozzi da Vignola and he did not make the distinctions between Mannerism and Baroque that modern writers do, and he ignored the later phase, the academic Baroque that lasted into the 18th century. Long despised, Baroque art and architecture became fashionable between the two World Wars, and has remained in critical favour. In painting the gradual rise in popular esteem of Caravaggio has been the best barometer of modern taste, William Watson describes a late phase of Shang-dynasty Chinese ritual bronzes of the 11th century BC as baroque. The term Baroque may still be used, usually pejoratively, describing works of art, craft, the appeal of Baroque style turned consciously from the witty, intellectual qualities of 16th-century Mannerist art to a visceral appeal aimed at the senses. It employed an iconography that was direct, simple, obvious, germinal ideas of the Baroque can also be found in the work of Michelangelo. Even more generalised parallels perceived by some experts in philosophy, prose style, see the Neapolitan palace of Caserta, a Baroque palace whose construction began in 1752. In paintings Baroque gestures are broader than Mannerist gestures, less ambiguous, less arcane and mysterious, more like the stage gestures of opera, Baroque poses depend on contrapposto, the tension within the figures that move the planes of shoulders and hips in counterdirections. Baroque is a style of unity imposed upon rich, heavy detail, Baroque style featured exaggerated lighting, intense emotions, release from restraint, and even a kind of artistic sensationalism. There were highly diverse strands of Italian baroque painting, from Caravaggio to Cortona, the most prominent Spanish painter of the Baroque was Diego Velázquez. The later Baroque style gradually gave way to a more decorative Rococo, while the Baroque nature of Rembrandts art is clear, the label is less often used for Vermeer and many other Dutch artists. Flemish Baroque painting shared a part in this trend, while continuing to produce the traditional categories
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Masaccio
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Masaccio, born Tommaso di Ser Giovanni di Simone, was the first great Italian painter of the Quattrocento period of the Italian Renaissance. Masaccio died at twenty-six and little is known about the circumstances of his death. The name Masaccio is a version of Maso, meaning clumsy or messy Tom. The name may have created to distinguish him from his principal collaborator, also called Maso. Despite his brief career, he had a influence on other artists. He was one of the first to use linear perspective in his painting, employing techniques such as vanishing point in art for the first time, Masaccio was born to Giovanni di Simone Cassai and Jacopa di Martinozzo in Castel San Giovanni di Altura, now San Giovanni Valdarno. His father was a notary and his mother the daughter of an innkeeper of Barberino di Mugello and his family name, Cassai, comes from the trade of his paternal grandfather Simone and granduncle Lorenzo, who were carpenters/cabinet makers. Masaccios father died in 1406, when he was five, later that same year a brother was born. He also was to become a painter, with the nickname of lo Scheggia meaning the splinter, there is no evidence for Masaccios artistic education, however Renaissance painters traditionally began an apprenticeship with an established master around the age of 12. Johannis Simonis pictor populi S. Nicholae de Florentia, the first works attributed to Masaccio are the San Giovenale Triptych, now in the Museum of Cascia di Reggello near Florence, and the Virgin and Child with Saint Anne at the Uffizi. The San Giovenale altarpiece was discovered in 1961 in the church of San Giovenale at Cascia di Reggello and it depicts the Virgin and Child with angels in the central panel, Sts. Bartholomew and Blaise on the panel, and Sts. Juvenal and Anthony Abbot in the right panel, the painting has lost much of its original framing, and its surface is badly abraded. The second work was perhaps Masaccios first collaboration with the older and already-renowned artist, Masolino is believed to have painted the figure of St. Anne and the angels that hold the cloth of honor behind her, while Masaccio painted the more important Virgin and Child on their throne. Masolinos figures are delicate, graceful and somewhat flat, while Masaccios are solid, in Florence, Masaccio could study the works of Giotto and become friends with Brunelleschi and Donatello. It was destroyed when the cloister was rebuilt at the end of the 16th century. With the two artists probably working simultaneously, the painting began around 1425, but for reasons the chapel was left unfinished. As a whole the frescoes represent human sin and its redemption through the actions of Peter, the style of Masaccios scenes shows the influence of Giotto especially
34.
Pietro Perugino
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Pietro Perugino, born Pietro Vannucci, was an Italian Renaissance painter of the Umbrian school, who developed some of the qualities that found classic expression in the High Renaissance. Raphael was his most famous pupil, Pietro Perugino was born Pietro Vannucci in Città della Pieve, Umbria, the son of Cristoforo Marie Vannucci. Pietros nickname characterizes him as from Perugia, the city of Umbria. Scholars continue to dispute the status of the Vannucci family. While certain academics maintain that Vannucci worked his way out of poverty and his exact date of birth is not known, although, based on his age at the death mentioned by Vasari and Giovanni Santi, he is suspected to be born between 1446 and 1452. Pietro most likely began studying painting in local workshops in Perugia such as those of Bartolomeo Caporali or Fiorenzo di Lorenzo, the date of this first Florentine sojourn is unknown, some make it as early as 1466/1470, others push the date to 1479. According to Vasari, he apprenticed in the workshop of Andrea del Verrocchio alongside Leonardo da Vinci, Domenico Ghirlandaio, Lorenzo di Credi, Filippino Lippi, piero della Francesca is thought to have taught him perspective form. In 1472 he must have completed his apprenticeship, for he was enrolled as a master in the Confraternity of St Luke, Pietro, although very talented was not extremely enthusiastic about his work. Perugino was one of the earliest Italian practitioners of oil painting, a good specimen of his early style in tempera is the tondo in the Musée du Louvre of the Virgin and Child Enthroned between Saints. Perugino returned from Florence to Perugia, where his Florentine training showed in the Adoration of the Magi for the church of Santa Maria dei Servi of Perugia, in about 1480, he was called to Rome by Sixtus IV to paint fresco panels for the Sistine Chapel walls. The frescoes he executed there included Moses and Zipporah, the Baptism of Christ, pinturicchio accompanied Perugino to Rome, and was made his partner, receiving a third of the profits. He may have some of the Zipporah subject. The Sistine frescoes were the major high Renaissance commission in Rome, the altar wall was also painted with the Assumption, the Nativity, and Moses in the Bulrushes. He had a studio in Florence, and received a great number of commissions. His Pietà in the Uffizi is an uncharacteristically stark work that avoids Peruginos sometimes too easy sentimental piety, in 1499 the guild of the cambio of Perugia asked him to decorate their audience-hall, the Sala delle Udienze del Collegio del Cambio. The humanist Francesco Maturanzio acted as his consultant, on the mid-pilaster of the hall Perugino placed his own portrait in bust-form. It is probable that Raphael, who in boyhood, towards 1496, had been placed by his uncles under the tuition of Perugino, Perugino was made one of the priors of Perugia in 1501. On one occasion Michelangelo told Perugino to his face that he was a bungler in art, Vannucci brought an action for defamation of character, unsuccessfully
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Titian
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Tiziano Vecelli or Tiziano Vecellio, known in English as Titian /ˈtɪʃən/, was an Italian painter, the most important member of the 16th-century Venetian school. He was born in Pieve di Cadore, near Belluno, during his lifetime he was often called da Cadore, taken from the place of his birth. His painting methods, particularly in the application and use of color, would exercise a profound influence not only on painters of the Italian Renaissance, during the course of his long life, Titians artistic manner changed drastically, but he retained a lifelong interest in color. Although his mature works may not contain the vivid, luminous tints of his pieces, their loose brushwork. The exact date of Titians birth is uncertain, when he was an old man he claimed in a letter to Philip II, King of Spain, to have been born in 1474, but this seems most unlikely. Other writers contemporary to his old age give figures that would equate to birthdates between 1473 and after 1482 and he was the son of Gregorio Vecelli and his wife Lucia. His father was superintendent of the castle of Pieve di Cadore, Gregorio was also a distinguished councilor and soldier. Many relatives, including Titians grandfather, were notaries, and the family of four were well-established in the area, at the age of about ten to twelve he and his brother Francesco were sent to an uncle in Venice to find an apprenticeship with a painter. At that time the Bellinis, especially Giovanni, were the artists in the city. There Titian found a group of men about his own age, among them Giovanni Palma da Serinalta, Lorenzo Lotto, Sebastiano Luciani. Francesco Vecellio, his brother, later became a painter of some note in Venice. A fresco of Hercules on the Morosini Palace is said to have one of Titians earliest works. Others were the Bellini-esque so-called Gypsy Madonna in Vienna, and the Visitation of Mary and Elizabeth, now in the Accademia, a Man with a Quilted Sleeve is an early portrait, painted around 1509 and described by Giorgio Vasari in 1568. Scholars long believed it depicted Ludovico Ariosto, but now think it is of Gerolamo Barbarigo, Rembrandt borrowed the composition for his self-portraits. Titian joined Giorgione as an assistant, but many contemporary critics found his work more impressive—for example in exterior frescoes that they did for the Fondaco dei Tedeschi. Their relationship evidently contained a significant element of rivalry, distinguishing between their work at this period remains a subject of scholarly controversy. A substantial number of attributions have moved from Giorgione to Titian in the 20th century, one of the earliest known Titian works, Christ Carrying the Cross in the Scuola Grande di San Rocco, depicting the Ecce Homo scene, was long regarded as by Giorgione. In 1507–1508 Giorgione was commissioned by the state to create frescoes on the re-erected Fondaco dei Tedeschi, Titian and Morto da Feltre worked along with him, and some fragments of paintings remain, probably by Giorgione
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Johannes Vermeer
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Johannes, Jan or Johan Vermeer was a Dutch painter who specialized in domestic interior scenes of middle-class life. Vermeer was a successful provincial genre painter in his lifetime. He evidently was not wealthy, leaving his wife and children in debt at his death, Vermeer worked slowly and with great care, and frequently used very expensive pigments. He is particularly renowned for his treatment and use of light in his work. Vermeer painted mostly domestic interior scenes and he was recognized during his lifetime in Delft and The Hague, but his modest celebrity gave way to obscurity after his death. He was barely mentioned in Arnold Houbrakens major source book on 17th-century Dutch painting, since that time, Vermeers reputation has grown, and he is now acknowledged as one of the greatest painters of the Dutch Golden Age. Relatively little was known about Vermeers life until recently and he seems to have been devoted exclusively to his art, living out his life in the city of Delft. Until the 19th century, the sources of information were some registers, a few official documents. John Michael Montias added details on the family from the city archives of Delft in his Artists and Artisans in Delft, Johannes Vermeer was baptized in the Reformed Church on 31 October 1632. His father Reijnier Janszoon was a worker of silk or caffa. As an apprentice in Amsterdam, Reijnier lived on fashionable Sint Antoniesbreestraat, in 1615, he married Digna Baltus. The couple moved to Delft and had a daughter named Geertruy who was baptized in 1620, in 1625, Reijnier was involved in a fight with a soldier named Willem van Bylandt who died from his wounds five months later. Around this time, Reijnier began dealing in paintings, in 1631, he leased an inn, which he called The Flying Fox. In 1635, he lived on Voldersgracht 25 or 26, in 1641, he bought a larger inn on the market square, named after the Flemish town Mechelen. The acquisition of the inn constituted a financial burden. When Vermeers father died in October 1652, Vermeer took over the operation of the art business. In April 1653, Johannes Reijniersz Vermeer married a Catholic girl, the blessing took place in the quiet nearby village of Schipluiden. Vermeers new mother-in-law Maria Thins was significantly wealthier than he, according to art historian Walter Liedtke, Vermeers conversion seems to have been made with conviction
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Mary, mother of Jesus
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Mary, also known by various titles, styles and honorifics, was a 1st-century Galilean Jewish woman of Nazareth and the mother of Jesus, according to the New Testament and the Quran. The gospels of Matthew and Luke in the New Testament and the Quran describe Mary as a virgin, the miraculous birth took place when she was already betrothed to Joseph and was awaiting the concluding rite of marriage, the formal home-taking ceremony. She married Joseph and accompanied him to Bethlehem, where Jesus was born, the Gospel of Luke begins its account of Marys life with the Annunciation, when the angel Gabriel appeared to her and announced her divine selection to be the mother of Jesus. According to canonical gospel accounts, Mary was present at the crucifixion and is depicted as a member of the early Christian community in Jerusalem. According to the Catholic and Orthodox teaching, at the end of her life her body was assumed directly into Heaven. Mary has been venerated since Early Christianity, and is considered by millions to be the most meritorious saint of the religion and she is claimed to have miraculously appeared to believers many times over the centuries. The Eastern and Oriental Orthodox, Roman Catholic, Anglican, and Lutheran churches believe that Mary, there is significant diversity in the Marian beliefs and devotional practices of major Christian traditions. The Roman Catholic Church holds distinctive Marian dogmas, namely her status as the Mother of God, her Immaculate Conception, her perpetual virginity, many Protestants minimize Marys role within Christianity, based on the argued brevity of biblical references. Mary also has a position in Islam, where one of the longer chapters of the Quran is devoted to her. Marys name in the manuscripts of the New Testament was based on her original Aramaic name ܡܪܝܡ. The English name Mary comes from the Greek Μαρία, which is a form of Μαριάμ. Both Μαρία and Μαριάμ appear in the New Testament, in Christianity, Mary is commonly referred to as the Virgin Mary, in accordance with the belief that she conceived Jesus miraculously through the Holy Spirit without her husbands involvement. The three main titles for Mary used by the Orthodox are Theotokos, Aeiparthenos as confirmed in the Second Council of Constantinople in 553, Catholics use a wide variety of titles for Mary, and these titles have in turn given rise to many artistic depictions. For example, the title Our Lady of Sorrows has inspired such masterpieces as Michelangelos Pietà, the title Theotokos was recognized at the Council of Ephesus in 431. However, this phrase in Greek, in the abbreviated form ΜΡ ΘΥ, is an indication commonly attached to her image in Byzantine icons. The Council stated that the Church Fathers did not hesitate to speak of the holy Virgin as the Mother of God, some Marian titles have a direct scriptural basis. For instance, the title Queen Mother has been given to Mary since she was the mother of Jesus, the scriptural basis for the term Queen can be seen in Luke 1,32 and the Isaiah 9,6. Queen Mother can be found in 1 Kings 2, 19-20 and Jeremiah 13, other titles have arisen from reported miracles, special appeals or occasions for calling on Mary
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Lake Baikal
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Lake Baikal is a rift lake in Russia, located in southern Siberia, between Irkutsk Oblast to the northwest and the Buryat Republic to the southeast. Lake Baikal is the largest freshwater lake by volume in the world, with 23,615.39 km3 of fresh water, it contains more water than the North American Great Lakes combined. With a maximum depth of 1,642 m, Baikal is the worlds deepest lake and it is considered among the worlds clearest lakes and is considered the worlds oldest lake — at 25 million years. It is the seventh-largest lake in the world by surface area, like Lake Tanganyika, Lake Baikal was formed as an ancient rift valley, having the typical long crescent shape with a surface area of 31,722 km2. Baikal is home to thousands of species of plants and animals, the lake was declared a UNESCO World Heritage Site in 1996. The region to the east of Lake Baikal is referred to as Transbaikalia, Lake Baikal is in a rift valley, created by the Baikal Rift Zone, where the Earths crust is slowly pulling apart. At 636 km long and 79 km wide, Lake Baikal has the largest surface area of any lake in Asia, at 31,722 km2. The bottom of the lake is 1,186.5 m below sea level, but below this lies some 7 km of sediment, placing the rift floor some 8–11 km below the surface, the deepest continental rift on Earth. In geological terms, the rift is young and active—it widens about 2 cm per year, the fault zone is also seismically active, hot springs occur in the area and notable earthquakes happen every few years. The lake is divided into three basins, North, Central, and South, with depths about 900 m,1,600 m, fault-controlled accommodation zones rising to depths about 300 m separate the basins. The North and Central basins are separated by Academician Ridge, while the area around the Selenga Delta, the lake drains into the Angara tributary of the Yenisei. Notable landforms include Cape Ryty on Baikals northwest coast, Baikals age is estimated at 25 million years, making it the most ancient lake in geological history. It is unique among large, high-latitude lakes, as its sediments have not been scoured by overriding continental ice sheets. Russian, U. S. and Japanese cooperative studies of deep-drilling core sediments in the 1990s provide a record of climatic variation over the past 6.7 million years. Longer and deeper sediment cores are expected in the near future, Lake Baikal is the only confined freshwater lake in which direct and indirect evidence of gas hydrates exists. The lake is surrounded by mountains. The Baikal Mountains on the shore and the taiga are technically protected as a national park. It contains 27 islands, the largest, Olkhon, is 72 km long and is the third-largest lake-bound island in the world, the lake is fed by as many as 330 inflowing rivers
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Andes
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The Andes or Andean Mountains are the longest continental mountain range in the world. They are a range of highlands along the western edge of South America. This range is about 7,000 km long, about 200 to 700 km wide, the Andes extend from north to south through seven South American countries, Venezuela, Colombia, Ecuador, Peru, Bolivia, Argentina and Chile. Along their length, the Andes are split into several ranges, the Andes are the location of several high plateaus – some of which host major cities, such as Quito, Bogotá, Arequipa, Medellín, Sucre, Mérida and La Paz. The Altiplano plateau is the worlds second-highest after the Tibetan plateau and these ranges are in turn grouped into three major divisions based on climate, the Tropical Andes, the Dry Andes, and the Wet Andes. The Andes are the worlds highest mountain range outside of Asia, the highest mountain outside Asia, Mount Aconcagua, rises to an elevation of about 6,961 m above sea level. The peak of Chimborazo in the Ecuadorean Andes is farther from the Earths center than any other location on the Earths surface, the worlds highest volcanoes are in the Andes, including Ojos del Salado on the Chile-Argentina border, which rises to 6,893 m. The etymology of the word Andes has been debated, the majority consensus is that it derives from the Quechua word anti, which means east as in Antisuyu, one of the four regions of the Inca Empire. In the northern part of the Andes, the isolated Sierra Nevada de Santa Marta range is considered to be part of the Andes. The term cordillera comes from the Spanish word cordel, meaning rope, the Andes range is about 200 km wide throughout its length, except in the Bolivian flexure where it is about 640 kilometres wide. The Andes are the result of plate tectonics processes, caused by the subduction of oceanic crust beneath the South American plate. The main cause of the rise of the Andes is the compression of the rim of the South American Plate due to the subduction of the Nazca Plate. In the south, the Andes share a boundary with the former Patagonia Terrane. To the west, the Andes end at the Pacific Ocean, from a geographical approach, the Andes are considered to have their western boundaries marked by the appearance of coastal lowlands and a less rugged topography. The Andes Mountains also contain large quantities of iron ore located in mountains within the range. The Andean orogen has a series of bends or oroclines, the Bolivian Orocline is a seaward concave bending in the coast of South America and the Andes Mountains at about 18° S. At this point the orientation of the Andes turns from Northwest in Peru to South in Chile, the Andean segment north and south of the orocline have been rotated 15° to 20° counter clockwise and clockwise respectively. The Bolivian Orocline area overlaps with the area of maximum width of the Altiplano Plateau, the specific point at 18° S where the coastline bends is known as the Arica Elbow
40.
Latin
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Latin is a classical language belonging to the Italic branch of the Indo-European languages. The Latin alphabet is derived from the Etruscan and Greek alphabets, Latin was originally spoken in Latium, in the Italian Peninsula. Through the power of the Roman Republic, it became the dominant language, Vulgar Latin developed into the Romance languages, such as Italian, Portuguese, Spanish, French, and Romanian. Latin, Italian and French have contributed many words to the English language, Latin and Ancient Greek roots are used in theology, biology, and medicine. By the late Roman Republic, Old Latin had been standardised into Classical Latin, Vulgar Latin was the colloquial form spoken during the same time and attested in inscriptions and the works of comic playwrights like Plautus and Terence. Late Latin is the language from the 3rd century. Later, Early Modern Latin and Modern Latin evolved, Latin was used as the language of international communication, scholarship, and science until well into the 18th century, when it began to be supplanted by vernaculars. Ecclesiastical Latin remains the language of the Holy See and the Roman Rite of the Catholic Church. Today, many students, scholars and members of the Catholic clergy speak Latin fluently and it is taught in primary, secondary and postsecondary educational institutions around the world. The language has been passed down through various forms, some inscriptions have been published in an internationally agreed, monumental, multivolume series, the Corpus Inscriptionum Latinarum. Authors and publishers vary, but the format is about the same, volumes detailing inscriptions with a critical apparatus stating the provenance, the reading and interpretation of these inscriptions is the subject matter of the field of epigraphy. The works of several hundred ancient authors who wrote in Latin have survived in whole or in part and they are in part the subject matter of the field of classics. The Cat in the Hat, and a book of fairy tales, additional resources include phrasebooks and resources for rendering everyday phrases and concepts into Latin, such as Meissners Latin Phrasebook. The Latin influence in English has been significant at all stages of its insular development. From the 16th to the 18th centuries, English writers cobbled together huge numbers of new words from Latin and Greek words, dubbed inkhorn terms, as if they had spilled from a pot of ink. Many of these words were used once by the author and then forgotten, many of the most common polysyllabic English words are of Latin origin through the medium of Old French. Romance words make respectively 59%, 20% and 14% of English, German and those figures can rise dramatically when only non-compound and non-derived words are included. Accordingly, Romance words make roughly 35% of the vocabulary of Dutch, Roman engineering had the same effect on scientific terminology as a whole
41.
Medieval Latin
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Despite the clerical origin of many of its authors, medieval Latin should not be confused with Ecclesiastical Latin. There is no consensus on the exact boundary where Late Latin ends. Medieval Latin had a vocabulary, which freely borrowed from other sources. Greek provided much of the vocabulary of Christianity. The various Germanic languages spoken by the Germanic tribes, who invaded southern Europe, were major sources of new words. Germanic leaders became the rulers of parts of the Roman Empire that they conquered, other more ordinary words were replaced by coinages from Vulgar Latin or Germanic sources because the classical words had fallen into disuse. Latin was also spread to such as Ireland and Germany. Works written in the lands, where Latin was a language with no relation to the local vernacular, also influenced the vocabulary. English words like abstract, subject, communicate, matter, probable, the high point of the development of medieval Latin as a literary language came with the Carolingian renaissance, a rebirth of learning kindled under the patronage of Charlemagne, king of the Franks. On the other hand, strictly speaking there was no form of medieval Latin. Every Latin author in the period spoke Latin as a second language, with varying degrees of fluency, and syntax, grammar. For instance, rather than following the classical Latin practice of placing the verb at the end. Unlike classical Latin, where esse was the auxiliary verb, medieval Latin writers might use habere as an auxiliary, similar to constructions in Germanic. The accusative and infinitive construction in classical Latin was often replaced by a clause introduced by quod or quia. This is almost identical, for example, to the use of que in similar constructions in French. In every age from the late 8th century onwards, there were learned writers who were familiar enough with classical syntax to be aware that these forms and usages were wrong, however the use of quod to introduce subordinate clauses was especially pervasive and is found at all levels. That resulted in two features of Medieval Latin compared with Classical Latin. First, many attempted to show off their knowledge of Classical Latin by using rare or archaic constructions
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Arabic
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Arabic is a Central Semitic language that was first spoken in Iron Age northwestern Arabia and is now the lingua franca of the Arab world. Arabic is also the language of 1.7 billion Muslims. It is one of six languages of the United Nations. The modern written language is derived from the language of the Quran and it is widely taught in schools and universities, and is used to varying degrees in workplaces, government, and the media. The two formal varieties are grouped together as Literary Arabic, which is the language of 26 states. Modern Standard Arabic largely follows the standards of Quranic Arabic. Much of the new vocabulary is used to denote concepts that have arisen in the post-Quranic era, Arabic has influenced many languages around the globe throughout its history. During the Middle Ages, Literary Arabic was a vehicle of culture in Europe, especially in science, mathematics. As a result, many European languages have borrowed many words from it. Many words of Arabic origin are found in ancient languages like Latin. Balkan languages, including Greek, have acquired a significant number of Arabic words through contact with Ottoman Turkish. Arabic has also borrowed words from languages including Greek and Persian in medieval times. Arabic is a Central Semitic language, closely related to the Northwest Semitic languages, the Ancient South Arabian languages, the Semitic languages changed a great deal between Proto-Semitic and the establishment of the Central Semitic languages, particularly in grammar. Innovations of the Central Semitic languages—all maintained in Arabic—include, The conversion of the suffix-conjugated stative formation into a past tense, the conversion of the prefix-conjugated preterite-tense formation into a present tense. The elimination of other prefix-conjugated mood/aspect forms in favor of new moods formed by endings attached to the prefix-conjugation forms, the development of an internal passive. These features are evidence of descent from a hypothetical ancestor. In the southwest, various Central Semitic languages both belonging to and outside of the Ancient South Arabian family were spoken and it is also believed that the ancestors of the Modern South Arabian languages were also spoken in southern Arabia at this time. To the north, in the oases of northern Hijaz, Dadanitic and Taymanitic held some prestige as inscriptional languages, in Najd and parts of western Arabia, a language known to scholars as Thamudic C is attested
43.
Persian language
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Persian, also known by its endonym Farsi, is one of the Western Iranian languages within the Indo-Iranian branch of the Indo-European language family. It is primarily spoken in Iran, Afghanistan, and Tajikistan and it is mostly written in the Persian alphabet, a modified variant of the Arabic script. Its grammar is similar to that of many contemporary European languages, Persian gets its name from its origin at the capital of the Achaemenid Empire, Persis, hence the name Persian. A Persian-speaking person may be referred to as Persophone, there are approximately 110 million Persian speakers worldwide, with the language holding official status in Iran, Afghanistan, and Tajikistan. For centuries, Persian has also been a cultural language in other regions of Western Asia, Central Asia. It also exerted influence on Arabic, particularly Bahrani Arabic. Persian is one of the Western Iranian languages within the Indo-European family, other Western Iranian languages are the Kurdish languages, Gilaki, Mazanderani, Talysh, and Balochi. Persian is classified as a member of the Southwestern subgroup within Western Iranian along with Lari, Kumzari, in Persian, the language is known by several names, Western Persian, Parsi or Farsi has been the name used by all native speakers until the 20th century. Since the latter decades of the 20th century, for reasons, in English. Tajiki is the variety of Persian spoken in Tajikistan and Uzbekistan by the Tajiks, according to the Oxford English Dictionary, the term Persian as a language name is first attested in English in the mid-16th century. Native Iranian Persian speakers call it Fārsi, Farsi is the Arabicized form of Pārsi, subsequent to Muslim conquest of Persia, due to a lack of the phoneme /p/ in Standard Arabic. The origin of the name Farsi and the place of origin of the language which is Fars Province is the Arabicized form of Pārs, in English, this language has historically been known as Persian, though Farsi has also gained some currency. Farsi is encountered in some literature as a name for the language. In modern English the word Farsi refers to the language while Parsi describes Zoroastrians, some Persian language scholars such as Ehsan Yarshater, editor of Encyclopædia Iranica, and University of Arizona professor Kamran Talattof, have also rejected the usage of Farsi in their articles. The international language-encoding standard ISO 639-1 uses the code fa, as its system is mostly based on the local names. The more detailed standard ISO 639-3 uses the name Persian for the dialect continuum spoken across Iran and Afghanistan and this consists of the individual languages Dari and Iranian Persian. Currently, Voice of America, BBC World Service, Deutsche Welle, Radio Free Europe/Radio Liberty also includes a Tajik service and an Afghan service. This is also the case for the American Association of Teachers of Persian, The Centre for Promotion of Persian Language and Literature, Persian is an Iranian language belonging to the Indo-Iranian branch of the Indo-European family of languages
44.
Angel
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An angel, especially according to Abrahamic religions and Zoroastrianism, is a spiritual being superior to humans in power and intelligence. Most of them either as intermediaries between Heaven and Earth, or as guardian spirits. They are studied in the doctrine of angelology. In Christian Science, the angel is used to refer to an inspiration from God. In fine art, angels are depicted as having the shape of human beings of extraordinary beauty, they are often identified using the symbols of bird wings, halos. The word angel in English is a blend of Old English engel, both derive from Late Latin angelus messenger, which in turn was borrowed from Late Greek ἄγγελος ángelos. According to R. S. P. Beekes, ángelos itself may be an Oriental loan, the words earliest form is Mycenaean a-ke-ro attested in Linear B syllabic script. The ángelos is the default Septuagints translation of the Biblical Hebrew term mal’ākh denoting simply messenger without specifying its nature. In the Latin Vulgate, however, the meaning becomes bifurcated, if the word refers to some supernatural being, the word angelus appears. Such differentiation has been taken over by later vernacular translations of the Bible, early Christian and Jewish exegetes, in Zoroastrianism there are different angel-like figures. For example, each person has one guardian angel, called Fravashi and they patronize human beings and other creatures, and also manifest Gods energy. In the commentaries of Proclus on the Timaeus of Plato, Proclus uses the terminology of angelic, according to Aristotle, just as there is a First Mover, so, too, must there be spiritual secondary movers. The Torah uses the terms מלאך אלהים, מלאך יהוה, בני אלהים and הקודשים to refer to beings traditionally interpreted as angels, later texts use other terms, such as העליונים. The term מלאך is also used in books of the Tanakh. Depending on the context, the Hebrew word may refer to a messenger or to a supernatural messenger. Daniel is the first biblical figure to refer to individual angels by name, mentioning Gabriel in Daniel 9,21 and these angels are part of Daniels apocalyptic visions and are an important part of all apocalyptic literature. One of these is hāšāṭān, a figure depicted in the Book of Job, philo of Alexandria identifies the angel with the Logos inasmuch as the angel is the immaterial voice of God. The angel is something different from God himself, but is conceived as Gods instrument, in post-Biblical Judaism, certain angels took on particular significance and developed unique personalities and roles
45.
Silicate mineral
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Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of rock-forming minerals and they are classified based on the structure of their silicate groups, which contain different ratios of silicon and oxygen. Nesosilicates, or orthosilicates, have the orthosilicate ion, which constitute isolated 4− tetrahedra that are connected only by interstitial cations and these exist as 3-member 6− and 6-member 12− rings, where T stands for a tetrahedrally coordinated cation. Inosilicates, or chain silicates, have interlocking chains of silicate tetrahedra with either SiO3,1,3 ratio, for single chains or Si4O11,4,11 ratio, for double chains. Nickel–Strunz classification,09. D Pyroxene group Enstatite – orthoferrosilite series Enstatite – MgSiO3 Ferrosilite – FeSiO3 Pigeonite – Ca0.251, all phyllosilicate minerals are hydrated, with either water or hydroxyl groups attached. Serpentine subgroup Antigorite – Mg3Si2O54 Chrysotile – Mg3Si2O54 Lizardite – Mg3Si2O54 Clay minerals group Halloysite – Al2Si2O54 Kaolinite – Al2Si2O54 Illite – 24O10 Montmorillonite –0 and this group comprises nearly 75% of the crust of the Earth. Tectosilicates, with the exception of the group, are aluminosilicates. Nickel–Strunz classification,09. F and 09. G,04. A, an introduction to the rock-forming minerals. Wise, W. S. Zussman, J. Rock-forming minerals, P.982 pp. Hurlbut, Cornelius S. Danas Manual of Mineralogy. Mindat. org, Dana classification Webmineral, Danas New Silicate Classification Media related to Silicates at Wikimedia Commons
46.
Sodalite
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Sodalite is a rich royal blue tectosilicate mineral widely used as an ornamental gemstone. Although massive sodalite samples are opaque, crystals are transparent to translucent. Sodalite is a member of the group with hauyne, nosean. A light, relatively hard yet fragile mineral, sodalite is named after its sodium content, well known for its blue color, sodalite may also be grey, yellow, green, or pink and is often mottled with white veins or patches. The more uniformly blue material is used in jewellery, where it is fashioned into cabochons, lesser material is more often seen as facing or inlay in various applications. Although somewhat similar to lazurite and lapis lazuli, sodalite rarely contains pyrite and it is further distinguished from similar minerals by its white streak. Sodalites six directions of cleavage may be seen as incipient cracks running through the stone. It is sometimes referred to as poor mans lapis due to its similar color and its name comes from its high sodium content. Most sodalite will fluoresce orange under ultraviolet light, and hackmanite exhibits tenebrescence, hackmanite is an important variety of sodalite exhibiting tenebrescence. When hackmanite from Mont Saint-Hilaire or Ilímaussaq is freshly quarried, it is pale to deep violet. Conversely, hackmanite from Afghanistan and the Myanmar Republic starts off creamy white, if left in a dark environment for some time, the violet will fade again. Tenebrescence is accelerated by the use of longwave or, particularly, much sodalite will also fluoresce a patchy orange under UV light. Sodalite was first described in 1811 for the occurrence in its locality in the Ilimaussaq complex, Narsaq. Occurring typically in massive form, sodalite is found as fillings in plutonic igneous rocks such as nepheline syenites. It is associated with other minerals typical of undersaturated environments, namely leucite, cancrinite and natrolite, other associated minerals include nepheline, titanian andradite, aegirine, microcline, sanidine, albite, calcite, fluorite, ankerite and baryte. Significant deposits of material are restricted to but a few locales, Bancroft, Ontario, and Mont-Saint-Hilaire, Quebec, in Canada, and Litchfield, Maine. The Ice River complex, near Golden, British Columbia, contains sodalite, smaller deposits are found in South America, Portugal, Romania, Burma and Russia. Hackmanite is found principally in Mont-Saint-Hilaire and Greenland, euhedral, transparent crystals are found in northern Namibia and in the lavas of Vesuvius, Italy
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