mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to dull luster, amorphous or cryptocrystalline structure.
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Physical properties
Hardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to dull luster, amorphous or cryptocrystalline structure.
Formation & geological history
Forms as a secondary mineral from the oxidation of iron-rich minerals in weathering environments.
Uses & applications
Historically used as an iron ore pigment (ochre) and in mineral collections.
Geological facts
Limonite is not a distinct mineral species, but rather a mixture of related iron oxides and hydroxides like goethite and lepidocrocite.
Field identification & locations
Identified by its characteristic yellowish-brown streak; found worldwide in gossans and weathered iron deposits.
