Ochre
Videos
Ochre is a family of natural clay earth pigments, made up of ferric oxide and varying amounts of clay and sand, ranging in colour from yellow to deep orange or brown. The term is also used for the col
Ochre pigment
Yellow ochre (Goldochre) pigment
Image of a horse coloured with yellow ochre (17,300 BC) from Lascaux cave, France
Image of a human hand created with red ochre in Pech Merle cave, France (Gravettian era, 25,000 BC)
Hematite
Videos
Hematite, also spelled as haematite, is a common iron oxide compound with the formula Fe2O3 and is widely found in rocks and soils. Hematite crystals belong to the rhombohedral lattice system which is
Ochre
…The term is also used for the colours produced by this pigment, especially a light brownish-yellow. A variant of ochre containing a large amount of hematite, or dehydrated iron oxide, has a reddish tint known as red ochre (or, in some dialects in England, ruddle). The term "ochre" is colloquially used to…
Hematite crystals from Brazil
Crystal structure of hematite
Image mosaic from the Mars Exploration Rover Microscopic Imager shows hematite spherules partly embedded in rock at the Opportunity landing site. Image is around 5 cm (2 in) across.
A rare pseudo-scalenohedral crystal habit