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, and 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 submetallic luster, and amorphous crystal structure.
Formation & geological history
Forms as a secondary mineral from the oxidation of other iron-bearing minerals in weathered ore deposits and sedimentary environments.
Uses & applications
Historically used as an iron ore and a yellow pigment (ochre); currently of interest mainly to mineral collectors.
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 characteristic yellowish-brown streak; found worldwide in gossans and weathered iron deposits.
