mineral
Limonite Nodules
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness varies from 4 to 5.5 on the Mohs scale, with a yellowish-brown to dark brown streak and submetallic to dull luster. It forms in amorphous or microcrystalline masses.
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Physical properties
Hardness varies from 4 to 5.5 on the Mohs scale, with a yellowish-brown to dark brown streak and submetallic to dull luster. It forms in amorphous or microcrystalline masses.
Formation & geological history
Formed via the oxidation of iron-bearing minerals or through chemical precipitation in sedimentary environments.
Uses & applications
Historically used as a yellow ochre pigment and as a minor ore of iron.
Geological facts
Limonite is not a distinct mineral species, but rather a natural mixture of hydrated iron oxides, principally goethite.
Field identification & locations
Identified by its characteristic yellowish-brown streak and earthy appearance, commonly found in gossans and weathered iron deposits.
