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 with no cleavage.
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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 with no cleavage.
Formation & geological history
Formed through the secondary alteration and weathering of other iron-bearing minerals in oxidizing environments.
Uses & applications
Historically used as a pigment (ochre) and historically as a minor ore of iron.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxides and hydroxides.
Field identification & locations
Identified easily by its distinctive yellowish-brown streak; found globally in weathered iron deposits and gossans.
