mineral
Limonite and Goethite Iron Ore
Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)
Hardness: 4 to 5.5 on the Mohs scale, Color: Brown, yellowish-brown, or reddish-brown, Luster: Submetallic, earthy, or silky, Crystal Structure: Amorphous or microcrystalline (pseudomorphic)
- Hardness
- 4 to 5
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Physical properties
Hardness: 4 to 5.5 on the Mohs scale, Color: Brown, yellowish-brown, or reddish-brown, Luster: Submetallic, earthy, or silky, Crystal Structure: Amorphous or microcrystalline (pseudomorphic)
Formation & geological history
Formed through the weathering and oxidation of other iron-bearing minerals in sedimentary environments or hydrothermal veins, often found in gossans above sulfide deposits.
Uses & applications
Historically used as an iron ore and pigment (ochre), currently collected by mineral enthusiasts.
Geological facts
Limonite is not a true distinct mineral species, but rather a mixture of related hydrated iron oxides, most commonly goethite.
Field identification & locations
Easily identified by its characteristic yellowish-brown streak and earthy brown color, commonly found worldwide in oxidized iron-rich deposits.
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Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
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Schist
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Septarian Pebble
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