mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness of 4 to 5.5 on the Mohs scale, yellow-brown to dark brown color, yellowish-brown streak, and submetallic to earthy luster.
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Physical properties
Hardness of 4 to 5.5 on the Mohs scale, yellow-brown to dark brown color, yellowish-brown streak, and submetallic to earthy luster.
Formation & geological history
Formed through the oxidation and weathering of iron-bearing minerals and in sedimentary environments like bogs and swamps.
Uses & applications
Historically used as a pigment (ochre) and historically as a minor iron ore; primarily sought by mineral collectors today.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of hydrated iron oxide minerals such as goethite and akaganeite.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak and earthy appearance; found worldwide, notably in oxidized iron deposits.
