mineral
Limonite Concretion
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, submetallic to earthy luster, and amorphous crystal structure.
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Physical properties
Hardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, submetallic to earthy luster, and amorphous crystal structure.
Formation & geological history
Formed through the secondary oxidation and weathering of primary iron-bearing minerals in sedimentary environments or hydrothermal veins.
Uses & applications
Historically used as a natural yellow-brown pigment (ochre) and as a minor ore of iron.
Geological facts
Limonite is not a distinct mineral species, but rather a catch-all term for natural iron oxide mixtures that lack visible crystals.
Field identification & locations
Easily identified by its characteristic yellowish-brown streak and earthy appearance; common globally in weathered iron deposits.
