Iron ochre
Index of articles associated with the same name
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Iron ochre or iron ocher (Ancient Greek: ὠχρός, pale yellow, orange) is one of several minerals found in iron ore.
| Iron ochre | |
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| General | |
| Category | Minerals |
Description
The term iron ochre, primarily used among mineral collectors, geologists, miners, and various other related professions,[citation needed] one of several iron ore minerals,[1]: 134 Common abrasives and pigments with a red-brown or brown-orange hue and the powdery consistency of ochre, were known under this name. The minerals include:
- hematite[2]: 85 — Fe2O3,[3]: 212 a widespread iron mineral, one of the most important iron ores
- limonite[2]: 85 — Fe2O3·Н2О,[4]: 30 a mixture of secondary natural minerals, iron oxide hydrates
- goethite[4]: 30 — α-FeO(OH), a product of weathering of ores, a secondary iron mineral, the main component of limonite, part of brown iron ores
- lepidocrocite (also known as "brown iron ochre") — γ-FeO(OH),[5]: 236 a secondary mineral, a product of the oxidation of iron ore minerals, found in brown iron ores
- ferric oxide[3]: 212 — Fe2O3 (oxides of iron), which also occurs naturally as the mineral magnetite
- ferrihydrite[6]: 338 — Fe2O3·0.5H2O, is a widespread hydrous ferric oxyhydroxide mineral at the Earth's surface
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