Iron ochre

Iron ochre
General
Category	Mineral

For other uses, see Ochre (disambiguation).

For other uses, see Iron (disambiguation).

Iron ochre or iron ocher (Ancient Greek: ὠχρός, pale yellow, orange) — at least three iron ore minerals, 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 — Fe₂O₃, a widespread iron mineral, one of the most important iron ores;
• Iron ochre or limonite — Fe₂O₃·Н₂О, a mixture of secondary natural minerals, iron oxide hydrates;
• Iron ochre or goethite — 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), a secondary mineral, a product of the oxidation of iron ore minerals, found in brown iron ores;
• Iron ochre or ferric oxide — Fe₂O₃ (oxides of iron), which also occurs naturally as the mineral magnetite;
• Iron ochre or ferrihydrite — Fe₂O₃·0.5H₂O, is a widespread hydrous ferric oxyhydroxide mineral at the Earth's surface;

Gallery

• 
  Hematite
• 
  Limonite
• 
  Goethite
• 
  Lepidocrocite
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  Ferric oxide
• 
  Ferrihydrite

See also

• Ochre
• Ochre (disambiguation)
• Iron (disambiguation)
• Iron(III) oxide
• List of inorganic pigments
• Red pigments
• List of colors
• Yellow