mineral
Limonite Nodule
Limonite (FeO(OH)·n(H2O))
AI-generated identification · may be incorrectHardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to sub-metallic luster, 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 sub-metallic luster, amorphous crystal structure.
Formation & geological history
Forms through the weathering and oxidation of iron-rich minerals in sedimentary and hydrothermal environments.
Uses & applications
Historically used as a source of iron ore and as a natural earth pigment for yellow ochre paint.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxides.
Field identification & locations
Easily identified by its distinctive yellowish-brown streak and earthy appearance; found worldwide in oxidized iron deposits.
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Limonite
FeO(OH)•nH2O
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