Natural Occurrences
Iron(III) oxide-hydroxide occurs naturally as the minerals goethite (CAS number), akaganéite (rarely found in weathered meteorites), lepidocrocite and feroxyhyte, as well as siderogel and limonite, which is a commonly found mixture of mainly goethite, lepidocrocite, quartz and clay minerals. Goethite and lepidocrocite, both crystallizing in orthorhombic system, are the most common forms of iron(III) oxide-hydroxide and the most important mineral carriers of iron in soils. The mineral ferrihydrite, also a soil constituent, is a related compound.
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