mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectMohs hardness 4-5.5, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure.
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Physical properties
Mohs hardness 4-5.5, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous crystal structure.
Formation & geological history
Formed via the secondary weathering and oxidation of iron-rich minerals and ores in hydrothermal veins or sedimentary deposits.
Uses & applications
Historically used as a natural earth pigment (ochre) and historically as a minor ore of iron.
Geological facts
Limonite is not a distinct mineral species, but rather a mixture of related hydrated iron oxides, principally goethite, lepidocrocite, and jarosite.
Field identification & locations
Identify by its characteristic yellowish-brown streak and earthy appearance; commonly found in iron-rich weathering zones worldwide.
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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