Iron ochre
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Iron ochre or iron ocher (Ancient Greek: ὠχρός, pale yellow, orange) — at least three iron ore minerals,[1]: 134 common abrasives and pigments with a red-brown or brown-orange hue and the powdery consistency of ocher, were known under such a trivial name. The term “iron ocher” was primarily used among mineral collectors, geologists, miners and representatives of related craft professions. It may refer to:
- Iron ochre or hematite[2]: 85 — Fe2O3,[3]: 212 a widespread iron mineral, one of the most important iron ores;
- Iron ochre or limonite[2]: 85 — Fe2O3·Н2О,[4]: 30 a mixture of secondary natural minerals, iron oxide hydrates;
- Iron ochre or goethite[4]: 30 — α-FeO(OH), a product of weathering of ores, a secondary iron mineral, the main component of limonite, is part of brown iron ores;
- Iron ochre, brown iron ocher or lepidocrocite — γ-FeO(OH),[5]: 236 a secondary mineral, a product of the oxidation of iron ore minerals, found in brown iron ores;
- Iron ochre or ferric oxide[3]: 212 — Fe2O3 (oxides of iron), which also occurs naturally as the mineral magnetite;
- Iron ochre or ferrihydrite[6]: 338 — Fe2O3·0.5H2O, is a widespread hydrous ferric oxyhydroxide mineral at the Earth's surface;
For other uses, see Ochre (disambiguation).
For other uses, see Iron (disambiguation).