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 sub-metallic luster, amorphous crystal structure, and a yellowish-brown streak.
Identified More mineral →
Explore Limonite in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to sub-metallic luster, amorphous crystal structure, and a yellowish-brown streak.
Formation & geological history
Forms as a secondary mineral from the oxidation of other iron-bearing minerals in weathered or sedimentary environments.
Uses & applications
Historically used as an iron ore and a yellow pigment (ochre).
Geological facts
Limonite is not a single mineral, but rather a mixture of hydrated iron oxide-hydroxides.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak and earthy appearance, commonly found worldwide in gossans and iron-rich soils.
