mineral
Limonite
FeO(OH)·nH2O
AI-generated identification · may be incorrectHardness is 4 to 5.5 on the Mohs scale. Color ranges from yellowish-brown to dark brown with a submetallic to earthy luster.
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Physical properties
Hardness is 4 to 5.5 on the Mohs scale. Color ranges from yellowish-brown to dark brown with a submetallic to earthy luster.
Formation & geological history
Formed through the oxidation and weathering of iron-bearing minerals in sedimentary or hydrothermal environments.
Uses & applications
Historically used as an iron ore and pigment, and occasionally collected as a mineral specimen.
Geological facts
Limonite is not a distinct mineral species, but rather a mixture of related hydrated iron oxides.
Field identification & locations
Identified by its characteristic yellowish-brown streak and earthy appearance, commonly found worldwide in gossans.
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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
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral