Goethite

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Goethite 
Frequency uncommon 
Hardness 5.5-6 
Density 3.3-4.3
Chemical Formula FeO(OH) 
Core Elements Fe 
Thermal Decomposition
FeO(OH)
600°C
FeO

Goethite is an iron ore that can contain up to 3% Nickel and 1% Cobalt. If the goethite contains additional structural water (FeO(OH)•H2O, FeO(OH)•2H2O...) it is referred to as limonite.

Uses

Primary

  • Goethite is also known as "bog iron", because it is often collected from the bottom of swamps, bogs, and other low-flow wetlands.

Secondary

  • Both Goethite and Limonite, as well as their roasting products, are used as yellow/orange/brown pigments

See Also

References