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 brownish-yellow streak and earthy to submetallic 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 brownish-yellow streak and earthy to submetallic luster.
Formation & geological history
Formed through the secondary alteration and weathering of other iron-bearing minerals in oxic environments.
Uses & applications
Historically used as a low-grade iron ore and as a pigment for yellow ochre paint.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of hydrated iron oxide-hydroxides, predominantly goethite.
Field identification & locations
Identify by its characteristic yellowish-brown streak and earthy appearance. Found worldwide in gossans and weathered iron deposits.
