Iron ochre
Iron ochre or iron ocher is one of several minerals found in iron ore.
Description
The term iron ochre, primarily used among mineral collectors, geologists, miners, and various other related professions, one of several iron ore minerals, 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 — Fe2O3, a widespread iron mineral, one of the most important iron ores
- limonite — Fe2O3·Н2О, a mixture of secondary natural minerals, iron oxide hydrates
- goethite — α-FeO, a product of weathering of ores, a secondary iron mineral, the main component of limonite, part of brown iron ores
- lepidocrocite — γ-FeO, a secondary mineral, a product of the oxidation of iron ore minerals, found in brown iron ores
- ferric oxide — Fe2O3, which also occurs naturally as the mineral magnetite
- ferrihydrite — Fe2O3·0.5H2O, is a widespread hydrous ferric oxyhydroxide mineral at the Earth's surface