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, earthy to submetallic luster, amorphous crystal structure, and a yellowish-brown streak.
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Physical properties
Hardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure, and a yellowish-brown streak.
Formation & geological history
Formed through the secondary oxidation and weathering of iron-bearing minerals in hydrothermal veins or sedimentary deposits.
Uses & applications
Historically used as a low-grade iron ore and as a natural earth pigment (ochre) for paints and dyes.
Geological facts
Limonite is not a distinct mineral species, but rather a mixture of related hydrated iron oxides and hydroxides.
Field identification & locations
Easily identified in the field by its characteristic yellowish-brown streak and earthy appearance; common worldwide in weathered iron deposits.
