mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous crystal structure.
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Physical properties
Hardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, amorphous crystal structure.
Formation & geological history
Formed as a secondary mineral through the weathering and oxidation of iron-rich minerals in sedimentary and hydrothermal environments.
Uses & applications
Historically used as a low-grade iron ore and as a yellowish-brown pigment (ochre) in paints.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxides.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak; found worldwide in gossans above iron ore deposits.
