mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectLimonite has a Mohs hardness of 4 to 5.5, a yellowish-brown to dark brown streak, and an earthy to submetallic luster.
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Physical properties
Limonite has a Mohs hardness of 4 to 5.5, a yellowish-brown to dark brown streak, and an earthy to submetallic luster.
Formation & geological history
It forms as a secondary mineral from the oxidation of other iron-bearing minerals in weathering environments.
Uses & applications
Historically used as a low-grade iron ore and as a brownish-yellow pigment called ochre.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxides.
Field identification & locations
Identify it by its characteristic yellowish-brown streak and amorphous, earthy masses found in gossans and iron-rich soils.
