Wüstite

wustite

andradite

hematite

hedenbergite

Formula: FeO
Simple oxide, periclase group
Magnesiowüstite is a variety of wüstite, FeO, that is also an iron-bearing variety of periclase, MgO

Crystal System: Isometric
Specific gravity: 5.88 measured, 5.97 calculated
Hardness: 5 to 5½
Colour: black
Environments:

Igneous environments
Meteorites

Wüstite may be found in kimberlite and basalt

Alteration

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
2Fe₂O₃ + 2FeO + 5SiO₂ + 4CaCO₃ → Ca₃Fe³⁺₂(SiO₄)₃ + CaFe²⁺Si₂O₆ +Fe²⁺Fe³⁺₂O₄ +4CO₂

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