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 with no distinct cleavage.
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 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, and amorphous crystal structure with no distinct cleavage.
Formation & geological history
Forms through the weathering and oxidation of iron-rich minerals and rocks in aqueous or sedimentary environments.
Uses & applications
Used historically as a natural pigment (ochre), a minor ore of iron, and occasionally cut into cabochons for jewelry.
Geological facts
Limonite is not a single mineral, but rather a mixture of hydrated iron oxide-hydroxide minerals like goethite and akagaganeite.
Field identification & locations
Easily identified in the field by its characteristic yellowish-brown streak; found worldwide in gossans and weathered ore deposits.
