Hardness: 5 to 5½
Wüstite may be found in kimberlite and
Wüstite is formed as an alteration product of other iron-bearing minerals at high temperatures in a highly reducing environment.
hematite, wüstite, quartz and calcite to andradite, hedenbergite, magnetite and CO2
If wüstite, FeO, is also introduced hedenbergite and magnetite may form in addition to andradite:
2Fe2O3 + 2FeO + 5SiO2 + 4CaCO3 → Ca3Fe3+2(SiO4)3 + CaFe2+Si2O6 +Fe2+Fe3+2O4 +4CO2
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