mineral
Limonite Concretion
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
AI-generated identification · may be incorrectMohs hardness of 4 to 5.5, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure.
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Physical properties
Mohs hardness of 4 to 5.5, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure.
Formation & geological history
Formed via the oxidation and weathering of iron-rich minerals in low-temperature aqueous environments.
Uses & applications
Used historically as a pigment (ochre) and minor ore of iron, but primarily collected as a geological specimen.
Geological facts
Limonite is not a distinct mineral species, but rather a catch-all term for natural mixtures of iron oxide minerals like goethite and lepidocrocite.
Field identification & locations
Identified by its characteristic yellowish-brown streak and botryoidal or concretionary habit; found worldwide in weathered iron deposits.
