1.
Precious metal
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A precious metal is a rare, naturally occurring metallic chemical element of high economic value. Chemically, the precious metals tend to be less reactive than most elements and they are usually ductile and have a high lustre. Historically, precious metals were important as currency but are now regarded mainly as investment, Gold, silver, platinum, and palladium each have an ISO4217 currency code. The best known precious metals are the metals, gold. Although both have industrial uses, they are known for their uses in art, jewelry, fine jewelry. Other precious metals include the platinum metals, ruthenium, rhodium, palladium, osmium, iridium. The demand for metals is driven not only by their practical use but also by their role as investments. Historically, precious metals have commanded much higher prices than common industrial metals, a metal is deemed to be precious if it is rare. The discovery of new sources of ore or improvements in mining or refining processes may cause the value of a metal to diminish. The status of a metal can also be determined by high demand or market value. Precious metals in bulk form are known as bullion and are traded on commodity markets, bullion metals may be cast into ingots or minted into coins. The defining attribute of bullion is that it is valued by its mass, the level of purity varies from issue to issue. The purest mass-produced bullion coins are in the Canadian Gold Maple Leaf series, a 100% pure bullion is nearly impossible, as the percentage of impurities diminishes, it becomes progressively more difficult to purify the metal further. Historically, coins had an amount of weight of alloy. The Krugerrand is the first modern example of measuring in pure gold, other bullion coins show neither the purity nor the fine-gold weight on the coin but are recognized and consistent in their composition. Many coins historically showed a denomination in currency, although nominally issued as legal tender, these coins face value as currency is far below that of their value as bullion. For instance, Canada mints a gold coin at a face value of $50 containing one troy ounce of gold—as of May 2011. Bullion coins minting by national governments gives them some numismatic value in addition to their bullion value, one of the largest bullion coins in the world was the 10, 000-dollar Australian Gold Nugget coin minted in Australia which consists of a full kilogram of 99. 9% pure gold
2.
Alloy
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An alloy is a mixture of metals or a mixture of a metal and another element. Alloys are defined by a metallic bonding character, an alloy may be a solid solution of metal elements or a mixture of metallic phases. Intermetallic compounds are alloys with a stoichiometry and crystal structure. Zintl phases are sometimes considered alloys depending on bond types. Alloys are used in a variety of applications. In some cases, a combination of metals may reduce the overall cost of the material while preserving important properties, in other cases, the combination of metals imparts synergistic properties to the constituent metal elements such as corrosion resistance or mechanical strength. Examples of alloys are steel, solder, brass, pewter, duralumin, bronze, the alloy constituents are usually measured by mass. Alloys are usually classified as substitutional or interstitial alloys, depending on the arrangement that forms the alloy. They can be classified as homogeneous, or heterogeneous or intermetallic. An alloy is a mixture of elements, which forms an impure substance that retains the characteristics of a metal. Alloys are made by mixing two or more elements, at least one of which is a metal and this is usually called the primary metal or the base metal, and the name of this metal may also be the name of the alloy. The other constituents may or may not be metals but, when mixed with the base, they will be soluble. The mechanical properties of alloys will often be different from those of its individual constituents. A metal that is very soft, such as aluminium, can be altered by alloying it with another soft metal. Although both metals are soft and ductile, the resulting aluminium alloy will have much greater strength. Adding a small amount of carbon to iron trades its great ductility for the greater strength of an alloy called steel. Due to its strength, but still substantial toughness, and its ability to be greatly altered by heat treatment, steel is one of the most useful. By adding chromium to steel, its resistance to corrosion can be enhanced, creating stainless steel, while adding silicon will alter its electrical characteristics, producing silicon steel
3.
Coin
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A coin is a small, flat, round piece of metal or plastic used primarily as a medium of exchange or legal tender. They are standardized in weight, and produced in quantities at a mint in order to facilitate trade. They are most often issued by a government, Coins are usually metal or alloy, or sometimes made of synthetic materials. Coins made of metal are stored in large quantities as bullion coins. Other coins are used as money in transactions, circulating alongside banknotes. Usually the highest value coin in circulation is less than the lowest-value note. In the last hundred years, the value of circulation coins has occasionally been lower than the value of the metal they contain. Exceptions to the rule of face value being higher than content value also occur for some bullion coins made of copper, silver, or gold, while the Eagle, Maple Leaf, and Sovereign coins have nominal face values, the Krugerrand does not. The first coins were developed independently in Iron Age Anatolia and Archaic Greece, India, Coins spread rapidly in the 6th and 5th centuries BCE, throughout Greece and Persia, and further to the Balkans. Standardized Roman currency was used throughout the Roman Empire, important Roman gold and silver coins were continued into the Middle Ages. Fiat money first arose in medieval China, with the paper money. Early paper money was introduced in Europe in the later Middle Ages, the penny was minted as a silver coin until the 17th century. The first circulating United States coins were cents, produced in 1793, Coins were an evolution of currency systems of the Late Bronze Age, where standard-sized ingots, and tokens such as knife money, were used to store and transfer value. In the late Chinese Bronze Age, standardized cast tokens were made and these were replicas in bronze of earlier Chinese currency, cowrie shells, so they were named Bronze Shell. According to Aristotle and Pollux, the first issuer of coins was Hermodike of Kyme The earliest coins are associated with Iron Age Anatolia. Early electrum coins were not standardized in weight, and in their earliest stage may have been ritual objects, such as badges or medals, issued by priests. The first Lydian coins were made of electrum, a naturally occurring alloy of silver, most of the early Lydian coins include no writing, only an image of a symbolic animal. Anatolian Artemis was the Πὀτνια Θηρῶν, whose symbol was the stag, a small percentage of early Lydian/Greek coins have a legend
4.
Copper
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Copper is a chemical element with symbol Cu and atomic number 29. It is a soft, malleable, and ductile metal with high thermal and electrical conductivity. A freshly exposed surface of copper has a reddish-orange color. Copper is one of the few metals that occur in nature in directly usable metallic form as opposed to needing extraction from an ore and this led to very early human use, from c.8000 BC. Copper used in buildings, usually for roofing, oxidizes to form a green verdigris, Copper is sometimes used in decorative art, both in its elemental metal form and in compounds as pigments. Copper compounds are used as agents, fungicides, and wood preservatives. Copper is essential to all living organisms as a trace dietary mineral because it is a key constituent of the enzyme complex cytochrome c oxidase. In molluscs and crustaceans, copper is a constituent of the blood pigment hemocyanin, replaced by the hemoglobin in fish. In humans, copper is found mainly in the liver, muscle, the adult body contains between 1.4 and 2.1 mg of copper per kilogram of body weight. The filled d-shells in these elements contribute little to interatomic interactions, unlike metals with incomplete d-shells, metallic bonds in copper are lacking a covalent character and are relatively weak. This observation explains the low hardness and high ductility of single crystals of copper, at the macroscopic scale, introduction of extended defects to the crystal lattice, such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is supplied in a fine-grained polycrystalline form. The softness of copper partly explains its high conductivity and high thermal conductivity. The maximum permissible current density of copper in open air is approximately 3. 1×106 A/m2 of cross-sectional area, Copper is one of a few metallic elements with a natural color other than gray or silver. Pure copper is orange-red and acquires a reddish tarnish when exposed to air, as with other metals, if copper is put in contact with another metal, galvanic corrosion will occur. A green layer of verdigris can often be seen on old structures, such as the roofing of many older buildings. Copper tarnishes when exposed to sulfur compounds, with which it reacts to form various copper sulfides. There are 29 isotopes of copper, 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper, both have a spin of 3⁄2
5.
Silver
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Silver is a metallic element with symbol Ag and atomic number 47. The symbol Ag stems from Latin argentum, derived from the Greek ὰργὀς, a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. The metal is found in the Earths crust in the pure, free form, as an alloy with gold and other metals. Most silver is produced as a byproduct of copper, gold, lead, Silver is more abundant than gold, but it is much less abundant as a native metal. Its purity is measured on a per mille basis, a 94%-pure alloy is described as 0.940 fine. As one of the seven metals of antiquity, silver has had a role in most human cultures. Silver has long valued as a precious metal. Silver metal is used in many premodern monetary systems in bullion coins, Silver is used in numerous applications other than currency, such as solar panels, water filtration, jewelry, ornaments, high-value tableware and utensils, and as an investment medium. Silver is used industrially in electrical contacts and conductors, in specialized mirrors, window coatings, Silver compounds are used in photographic film and X-rays. Dilute silver nitrate solutions and other compounds are used as disinfectants and microbiocides, added to bandages and wound-dressings, catheters. Silver is similar in its physical and chemical properties to its two neighbours in group 11 of the periodic table, copper and gold. This distinctive electron configuration, with an electron in the highest occupied s subshell over a filled d subshell. Silver is a soft, ductile and malleable transition metal. Silver crystallizes in a cubic lattice with bulk coordination number 12. Unlike metals with incomplete d-shells, metallic bonds in silver are lacking a covalent character and are relatively weak and this observation explains the low hardness and high ductility of single crystals of silver. Silver has a brilliant white metallic luster that can take a polish. Protected silver has greater optical reflectivity than aluminium at all wavelengths longer than ~450 nm, at wavelengths shorter than 450 nm, silvers reflectivity is inferior to that of aluminium and drops to zero near 310 nm. The electrical conductivity of silver is the greatest of all metals, greater even than copper, during World War II in the US,13540 tons of silver were used in electromagnets for enriching uranium, mainly because of the wartime shortage of copper
6.
Silver coin
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Silver coins are possibly the oldest mass-produced form of coinage. Silver has been used as a coinage metal since the times of the Greeks, the ancient Persians used silver coins between 612-330 BC. Before 1797, British pennies were made of silver, as with all collectible coins, many factors determine the value of a silver coin, such as its rarity, demand, condition and the number originally minted. Ancient silver coins coveted by collectors include the Denarius and Miliarense, while more recent collectible silver coins include the Morgan Dollar, other than collectors silver coins, silver bullion coins are popular among people who desire a hedge against currency inflation or store of value. Silver has a currency symbol of XAG under ISO4217. The earliest coins of the world were minted in the kingdom of Lydia in Asia Minor around 600 BC. The coins of Lydia were made of electrum, which is a naturally occurring alloy of gold and silver, the concept of coinage, i. e. stamped lumps of metal of a specified weight, quickly spread to adjacent regions, such as Aegina. In these neighbouring regions, inhabited by Greeks, coins were made of silver. As Greek merchants traded with Greek communities throughout the Mediterranean Sea and these early Greek silver coins were denominated in staters or drachmas and its fractions. More or less simultaneously with the development of the Lydian and Greek coinages, the Chinese coins, however, were a different concept and they were made of bronze. The coins of the Greeks were issued by a number of city states. The coinage systems were not entirely the same from one place to another, however, the so-called Attic standard, Corinthian standard, Aiginetic standard and other standards defined the proper weight of each coin. Each of these standards were used in places throughout the Mediterranean region. In the 4th century BC, the Kingdom of Macedonia came to dominate the Greek world, the most powerful of their kings, Alexander the Great eventually launched an attack on the Kingdom of Persia, defeating and conquering it. Greek coins were now issued by kings, and only to an extent by cities. Greek rulers were now minting coins as far away as Egypt, the tetradrachm was a popular coin throughout the region. This era is referred to as the hellenistic era, while much of the Greek world was being transformed into monarchies, the Romans were expanding their control throughout the Italian Peninsula. The Romans minted their first coins during the early 3rd century BC, the earliest coins were - like other coins in the region - silver drachms with a supplementary bronze coinage
7.
Mass
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In physics, mass is a property of a physical body. It is the measure of a resistance to acceleration when a net force is applied. It also determines the strength of its gravitational attraction to other bodies. The basic SI unit of mass is the kilogram, Mass is not the same as weight, even though mass is often determined by measuring the objects weight using a spring scale, rather than comparing it directly with known masses. An object on the Moon would weigh less than it does on Earth because of the lower gravity and this is because weight is a force, while mass is the property that determines the strength of this force. In Newtonian physics, mass can be generalized as the amount of matter in an object, however, at very high speeds, special relativity postulates that energy is an additional source of mass. Thus, any body having mass has an equivalent amount of energy. In addition, matter is a defined term in science. There are several distinct phenomena which can be used to measure mass, active gravitational mass measures the gravitational force exerted by an object. Passive gravitational mass measures the force exerted on an object in a known gravitational field. The mass of an object determines its acceleration in the presence of an applied force, according to Newtons second law of motion, if a body of fixed mass m is subjected to a single force F, its acceleration a is given by F/m. A bodys mass also determines the degree to which it generates or is affected by a gravitational field and this is sometimes referred to as gravitational mass. The standard International System of Units unit of mass is the kilogram, the kilogram is 1000 grams, first defined in 1795 as one cubic decimeter of water at the melting point of ice. Then in 1889, the kilogram was redefined as the mass of the prototype kilogram. As of January 2013, there are proposals for redefining the kilogram yet again. In this context, the mass has units of eV/c2, the electronvolt and its multiples, such as the MeV, are commonly used in particle physics. The atomic mass unit is 1/12 of the mass of a carbon-12 atom, the atomic mass unit is convenient for expressing the masses of atoms and molecules. Outside the SI system, other units of mass include, the slug is an Imperial unit of mass, the pound is a unit of both mass and force, used mainly in the United States
8.
Sterling silver
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Sterling silver is an alloy of silver containing 92.5 by weight of silver and 7.5 by weight of other metals, usually copper. The sterling silver standard has a minimum millesimal fineness of 925 and these replacement metals include germanium, zinc and platinum, as well as a variety of other additives, including silicon and boron. Alloys such as argentium silver have red in recent decades, one of the earliest attestations of the term is in Old French form esterlin, in a charter of the abbey of Les Préaux, dating to either 1085 or 1104. The English chronicler Orderic Vitalis uses the Latin forms libræ sterilensium, the word in origin refers to the newly introduced Norman silver penny. According to the Oxford English Dictionary, the most plausible etymology is derivation from a late Old English steorling, there are a number of obsolete hypotheses. One suggests a connection with starling, because four birds were depicted on a penny of Edward I, in 1260, Henry III granted them a charter of protection. Because the Leagues money was not frequently debased like that of England, English traders stipulated to be paid in pounds of the Easterlings, and land for their Kontor, the Steelyard of London, which by the 1340s was also called Easterlings Hall, or Esterlingeshalle. The Hanseatic League was officially active in the London trade from 1266 to 1597 and this etymology may have been first suggested by Walter de Pinchebek with the explanation that the coin was originally made by moneyers from that region. The claim has also made in Henry Spelmans glossary as referenced in Commentaries on the Laws of England. Yet another claim on this hypothesis is from Camden, as quoted in Chambers Journal of Popular Literature, Science and Arts. By 1854, the tie between Easterling and Sterling was well-established, as Ronald Zupko quotes in his dictionary of weights, the British numismatist Philip Grierson disagrees with the star etymology, as the stars appeared on Norman pennies only for the single three-year issue from 1077–1080. In support of this he cites the fact one of the first acts of the Normans was to restore the coinage to the consistent weight and purity it had in the days of Offa. This would have perceived as a contrast to the progressive debasement of the intervening 200 years. The sterling alloy originated in continental Europe and was being used for commerce as early as the 12th century in the area that is now northern Germany. A piece of sterling silver dating from Henry IIs reign was used as a standard in the Trial of the Pyx until it was deposited at the Royal Mint in 1843 and it bears the royal stamp ENRI. REX but this was added later, in the reign of Henry III and this is equivalent to a millesimal fineness of 926. In Colonial America, sterling silver was used for currency and general goods as well, between 1634 and 1776, some 500 silversmiths created items in the “New World” ranging from simple buckles to ornate Rococo coffee pots. Although silversmiths of this era were typically familiar with all precious metals, stamping each of their pieces with their personal makers mark, colonial silversmiths relied upon their own status to guarantee the quality and composition of their products
9.
Gold
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Gold is a chemical element with symbol Au and atomic number 79. In its purest form, it is a bright, slightly yellow, dense, soft, malleable. Chemically, gold is a metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions, Gold often occurs in free elemental form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the element silver and also naturally alloyed with copper. Less commonly, it occurs in minerals as gold compounds, often with tellurium, golds atomic number of 79 makes it one of the higher numbered, naturally occurring elements. It is thought to have produced in supernova nucleosynthesis, from the collision of neutron stars. Because the Earth was molten when it was formed, almost all of the present in the early Earth probably sank into the planetary core. Gold is resistant to most acids, though it does dissolve in aqua regia, a mixture of acid and hydrochloric acid. Gold also dissolves in solutions of cyanide, which are used in mining and electroplating. Gold dissolves in mercury, forming amalgam alloys, but this is not a chemical reaction, as a precious metal, gold has been used for coinage, jewelry, and other arts throughout recorded history. A total of 186,700 tonnes of gold is in existence above ground, the world consumption of new gold produced is about 50% in jewelry, 40% in investments, and 10% in industry. Gold is also used in infrared shielding, colored-glass production, gold leafing, certain gold salts are still used as anti-inflammatories in medicine. As of 2014, the worlds largest gold producer by far was China with 450 tonnes, Gold is cognate with similar words in many Germanic languages, deriving via Proto-Germanic *gulþą from Proto-Indo-European *ǵʰelh₃-. The symbol Au is from the Latin, aurum, the Latin word for gold, the Proto-Indo-European ancestor of aurum was *h₂é-h₂us-o-, meaning glow. This word is derived from the root as *h₂éu̯sōs, the ancestor of the Latin word Aurora. This etymological relationship is presumably behind the frequent claim in scientific publications that aurum meant shining dawn, Gold is the most malleable of all metals, a single gram can be beaten into a sheet of 1 square meter, and an avoirdupois ounce into 300 square feet. Gold leaf can be thin enough to become semi-transparent
10.
Platinum
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Platinum is a chemical element with symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious and its name is derived from the Spanish term platina, translated into little silver. Platinum is a member of the group of elements and group 10 of the periodic table of elements. It has six naturally occurring isotopes and it is one of the rarer elements in Earths crust with an average abundance of approximately 5 μg/kg. It occurs in some nickel and copper ores along with some deposits, mostly in South Africa. Because of its scarcity in Earths crust, only a few hundred tonnes are produced annually, Platinum is one of the least reactive metals. It has remarkable resistance to corrosion, even at high temperatures, consequently, platinum is often found chemically uncombined as native platinum. Because it occurs naturally in the sands of various rivers. Platinum is used in catalytic converters, laboratory equipment, electrical contacts and electrodes, platinum resistance thermometers, dentistry equipment, and jewelry. Being a heavy metal, it leads to health issues upon exposure to its salts, compounds containing platinum, such as cisplatin, oxaliplatin and carboplatin, are applied in chemotherapy against certain types of cancer. Pure platinum is a lustrous, ductile, and malleable, silver-white metal, Platinum is more ductile than gold, silver or copper, thus being the most ductile of pure metals, but it is less malleable than gold. The metal has excellent resistance to corrosion, is stable at temperatures and has stable electrical properties. Platinum reacts with oxygen slowly at high temperatures. It reacts vigorously with fluorine at 500 °C to form platinum tetrafluoride and it is also attacked by chlorine, bromine, iodine, and sulfur. Platinum is insoluble in hydrochloric and nitric acid, but dissolves in hot aqua regia to form chloroplatinic acid and its physical characteristics and chemical stability make it useful for industrial applications. Its resistance to wear and tarnish is well suited to use in fine jewelry, the most common oxidation states of platinum are +2 and +4. The +1 and +3 oxidation states are common, and are often stabilized by metal bonding in bimetallic species. As is expected, tetracoordinate platinum compounds tend to adopt 16-electron square planar geometries, Platinum has six naturally occurring isotopes, 190Pt, 192Pt, 194Pt, 195Pt, 196Pt, and 198Pt
11.
Troy weight
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Troy weight is a system of units of mass customarily used for precious metals and gemstones. One troy ounce equals 31.1034768 grams exactly, there are only 12 troy ounces per troy pound, rather than the 16 ounces per pound found in the more common avoirdupois system. However, the pound has 7000 grains whereas the troy pound has only 5760 grains. Both systems use the same grain defined by the international yard, therefore the troy ounce is 480 grains, compared with the avoirdupois ounce, which is 437.5 grains. So the troy ounce is about 10% heavier than the avoirdupois ounce, although troy ounces are still used to weigh gold, silver, and gemstones, troy weight is no longer used in most other applications. One troy ounce of gold is denoted with the ISO4217 currency code XAU, troy weight probably takes its name from the French market town of Troyes in France where English merchants traded at least as early as the early 9th century. The name troy is first attested in 1390, describing the weight of a platter, the word troni refers to markets. Watson finds the dialect word troi, meaning a balance in Wrights Dialect Dictionary, troy weight referred to the tower system, the earliest reference to the modern troy weights is in 1414. Many aspects of the weight system were indirectly derived from the Roman monetary system. The Romans used bronze bars of varying weights as currency, an aes grave weighed 1 pound. One twelfth of an aes grave was called an uncia, or in English an ounce, before the adoption of the metric system, many systems of troy weights were in use in various parts of Europe, among them Holland troy, Paris troy, etc. Their values varied from one another by up to several percentage points, troy weights were first used in England in the 15th century, and were made official for gold and silver in 1527. The British Imperial system of weights and measures was established in 1824, the troy ounce in use today is essentially the same as the British Imperial troy ounce, adopted as an official weight standard for United States coinage by Act of Congress on May 19,1828. The British Imperial troy ounce was based on, and virtually identical with, the pre-1824 British troy ounce, the English troy ounce was officially adopted for coinage in 1527. Troy ounces have been used in England since about 1400, before that, various sorts of troy ounces were in use on the continent. The troy ounce and grain were also part of the apothecaries system and this was long used in medicine, but has now been largely replaced by the metric system. The only troy weight in widespread use today is the British Imperial troy ounce, both are currently based on a grain of 0.06479891 gram, with 480 grains to a troy ounce. The British Empire abolished the 12-ounce troy pound in the 19th century, the origin of the troy weight system is unknown
12.
Ducat
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The ducat /ˈdʌkət/ was a gold or silver coin used as a trade coin in Europe from the later medieval centuries until as late as the 20th century. Many types of ducats had various metallic content and purchasing power throughout the period, the gold ducat of Venice gained wide international acceptance, like the medieval Byzantine hyperpyron and the Florentine florin, or the modern British pound sterling and the United States dollar. The word ducat is from Medieval Latin ducatus = relating to a duke, Doge Enrico Dandolo of Venice, whose title means duke, introduced a silver ducat whose types are related to the ducats of Roger II. Later gold ducats of Venice, however, became so important that the name ducat was associated exclusively with them, the Venetian business model of the 13th century was importing goods from the East and selling them at a profit north of the Alps. They paid for goods with Byzantine gold coins but when the Byzantine emperor Michael VIII Palaiologos backed a rebellion called the Sicilian Vespers in 1282. This was just one more in a series of debasements of the hyperpyron, both Florence and Genoa had introduced gold coins in 1252 and the florin of Florence had become the standard European gold coin. Venice modeled the size and weight of their ducat on the florin, the Venetian ducat contained 3.545 grams of 99. 47% fine gold, the highest purity medieval metallurgy could produce. Gold ducat types derive from silver ducat types, which were ultimately Byzantine, the obverse shows the Doge of Venice kneeling before St. Mark, the patron saint of Venice. Saint Mark holds the gospel, which is his usual attribute, the legend on the left identifies the saint as S M VENET, i. e. Saint Mark of Venice, and the legend on the right identifies the doge, with his title DVX in the field. On the reverse, Christ stands among a field of stars in an oval frame, the reverse legend is the same as on Roger II’s ducats. Succeeding doges of Venice continued striking ducats, changing only their name on the obverse, during the 15th century, the value of the ducat in terms of silver money was stable at 124 Venetian soldi, i. e. schillings. The term ducat became identified with this amount of money as well as the gold coin. Conflict between England and Spain in 1567, however, increased the price of gold and upset this equivalence, at this point, the coin was called the ducato de zecca, i. e. ducat of the mint, which was shortened to zecchino and corrupted to sequin. Leonardo Loredan extended the coinage with a half ducat and subsequent doges added a quarter, all of these coins continued to use the designs and weight standards of the original 1284 ducat. Even after dates became a feature of western coinage, Venice struck ducats without them until Napoleon ended the Venetian Republic in 1797. Instead, the Roman coin showed a senator kneeling before St. Peter on the obverse, the Popes subsequently changed these designs, but continued to strike ducats of the same weight and size into the 16th century. Most imitations of the Venetian ducat were made in the Levant, the Knights of Saint John struck ducats with grand master Dieudonné de Gozon, 1346-1353, kneeling before Saint John on the obverse and an angel seated on the Sepulcher of Christ on the reverse. Subsequent Grand masters, however, found it expedient to copy the Venetian types more exactly, first at Rhodes and they struck ducats at Chios that could be distinguished from the Venetian originals only by their workmanship
