mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, and amorphous or microcrystalline structure.
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Physical properties
Hardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, and amorphous or microcrystalline structure.
Formation & geological history
Formed through the oxidation and weathering of iron-bearing minerals in sedimentary environments and hydrothermal veins.
Uses & applications
Used historically as a pigment (ochre) and as a minor ore of iron.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrous iron oxides like goethite and lepidocrocite.
Field identification & locations
Easily identified in the field by its characteristic yellowish-brown streak; found worldwide in gossans and weathered iron deposits.
