mineral
Limonite with Goethite
Hydrated iron oxide-hydroxide, FeO(OH)·nH2O
AI-generated identification · may be incorrectHardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to sub-metallic luster, amorphous or microcrystalline structure, and yellowish-brown streak.
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Physical properties
Hardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to sub-metallic luster, amorphous or microcrystalline structure, and yellowish-brown streak.
Formation & geological history
Formed through the secondary oxidation and weathering of primary iron-bearing minerals in hydrothermal veins or sedimentary iron deposits.
Uses & applications
Historically used as a natural earth pigment (ochre) and as a minor ore of iron.
Geological facts
Limonite is not a true distinct mineral species, but rather a catch-all term for natural mixtures of hydrated iron oxides, primarily goethite and lepidocrocite.
Field identification & locations
Easily identified in the field by its characteristic yellowish-brown streak and earthy yellow-brown coating on rocks; found worldwide in weathered iron deposits.
