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.
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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.
Formation & geological history
Formed through the oxidation and weathering of iron-bearing primary minerals in sedimentary, metamorphic, and igneous environments.
Uses & applications
Historically used as a low-grade iron ore and as a natural yellowish-brown earth pigment for paints.
Geological facts
Limonite is not a true discrete mineral, but rather a mixture of hydrated iron oxide-hydroxide minerals like goethite and lepidocrocite.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak; commonly found in gossans above sulfide ore deposits worldwide.
