mineral
Limonite
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 submetallic 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, earthy to submetallic luster, and amorphous crystal structure.
Formation & geological history
Formed through the secondary oxidation and weathering of iron-bearing minerals in sedimentary and hydrothermal environments.
Uses & applications
Historically used as a low-grade iron ore and as a natural earth pigment for yellow ochre paint.
Geological facts
Limonite is not a true distinct mineral, but rather a mixture of related hydrated iron oxides like goethite and lepidocrocite.
Field identification & locations
Easily identified in the field by its characteristic yellowish-brown streak; commonly found in iron-rich weathering crusts worldwide.
