mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness of 4 to 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 to 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 weathering of iron-bearing oxide minerals in oxidizing environments.
Uses & applications
Used historically as an iron ore and as a pigment in paints known as yellow ochre.
Geological facts
Limonite is not a true distinct mineral, but rather a mixture of hydrated iron oxides like goethite and lepidocrocite.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak; found globally in iron-rich weathering zones.
