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, amorphous or cryptocrystalline crystal structure, specific gravity of 2.7 to 4.3.
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Physical properties
Hardness of 4 to 5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy to submetallic luster, amorphous or cryptocrystalline crystal structure, specific gravity of 2.7 to 4.3.
Formation & geological history
Formed through the weathering and oxidation of iron-rich minerals and rocks, typically found in gossans, bog iron deposits, and sedimentary environments.
Uses & applications
Historically used as a pigment (ochre), as an iron ore, and occasionally as a minor ornamental stone by collectors.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxides, most commonly goethite, lepidocrocite, and jarosite.
Field identification & locations
Can be identified easily in the field by its characteristic yellowish-brown or brownish-yellow streak and earthy appearance. Found worldwide wherever iron-bearing rocks weather.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous