mineral
Limonite
Hydrated iron oxide-hydroxide, 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
Forms through the weathering and oxidation of iron-rich minerals, often in sedimentary environments or gossans above sulfide deposits.
Uses & applications
Historically used as an iron ore and pigment, and occasionally cut into cabochons for jewelry.
Geological facts
Limonite is not a single mineral, but rather a mixture of related hydrated iron oxide minerals like goethite and lepidocrocite.
Field identification & locations
Identified by its characteristic yellowish-brown streak and earthy appearance; found worldwide in weathered iron deposits.
