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, submetallic to earthy 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, submetallic to earthy luster, amorphous crystal structure.
Formation & geological history
Formed through the weathering and oxidation of iron-bearing minerals, commonly found in sedimentary environments and gossans.
Uses & applications
Used historically as an iron ore and pigment, and occasionally collected as a mineral specimen.
Geological facts
Limonite is not a true distinct mineral, but rather a mixture of related hydrated iron oxides and hydroxides.
Field identification & locations
Identified easily by its characteristic yellowish-brown streak; found globally where iron deposits undergo weathering.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Limonite
FeO(OH)•nH2O
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Feldspar
Feldspar Group (Tectosilicate, e.g., KAlSi3O8)
mineral
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous