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 an earthy to submetallic luster and a yellowish-brown streak.
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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 an earthy to submetallic luster and a yellowish-brown streak.
Formation & geological history
Forms as a secondary mineral resulting from the oxidation of various 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. It is extremely common worldwide and frequently pseudomorphs after other minerals like pyrite.
Field identification & locations
Identified by its characteristic yellowish-brown streak and earthy appearance. Highly plausible in Colorado's mineral-rich Front Range near the provided coordinates.
