mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness is 4 to 5.5 on the Mohs scale. Color ranges from yellowish-brown to dark brown with a submetallic to earthy luster.
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Physical properties
Hardness is 4 to 5.5 on the Mohs scale. Color ranges from yellowish-brown to dark brown with a submetallic to earthy luster.
Formation & geological history
Forms as a secondary mineral from the oxidation of iron-bearing minerals in weathering 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 oxide-hydroxides.
Field identification & locations
Identified by its characteristic yellowish-brown streak; commonly found in gossans above sulfide ore deposits.
