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 sub-metallic 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, earthy to sub-metallic luster, amorphous crystal structure.
Formation & geological history
Formed through the secondary alteration and weathering of other iron-bearing minerals in oxidizing environments.
Uses & applications
Historically used as a low-grade iron ore and as a yellow pigment (ochre) in paints.
Geological facts
Limonite is not a single mineral, but rather a mixture of hydrated iron oxides and hydroxides.
Field identification & locations
Identified primarily by its characteristic yellowish-brown streak and earthy appearance; found worldwide in gossans and weathered iron deposits.
