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, amorphous crystal 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, amorphous crystal structure.
Formation & geological history
Formed through the weathering and oxidation of iron-rich minerals in sedimentary, igneous, and metamorphic environments.
Uses & applications
Historically used as a pigment (ochre) and historically as a minor ore of iron.
Geological facts
Limonite is not a distinct mineral species, but rather a mixture of related hydrated iron oxides.
Field identification & locations
Identified by its characteristic yellowish-brown streak and earthy appearance; found worldwide.
