mineral
Limonite
FeO(OH)•nH2O
AI-generated identification · may be incorrectHardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy luster, amorphous crystal structure, and a yellowish-brown streak.
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Physical properties
Hardness of 4-5.5 on the Mohs scale, yellowish-brown to dark brown color, earthy luster, amorphous crystal structure, and a yellowish-brown streak.
Formation & geological history
Formed through the secondary alteration and oxidation of iron-bearing minerals, commonly in weathering zones or bog environments.
Uses & applications
Historically used as a low-grade iron ore and pigment (ochre), with limited value for collectors.
Geological facts
Limonite is not a true mineral species, but rather a mixture of related hydrated iron oxides and hydroxides.
Field identification & locations
Identified primarily by its characteristic yellowish-brown streak and earthy appearance, found worldwide in gossans and iron-rich soils.
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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