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 or hydrothermal environments.
Uses & applications
Historically used as a pigment for paints (ochre) and as a minor ore of iron.
Geological facts
Often found in nodular or botryoidal masses resembling small potatoes or clustered shapes, sometimes called iron paint pots.
Field identification & locations
Identify by its characteristic yellowish-brown streak and earthy appearance; commonly found in oxidized zones of iron deposits worldwide.
