Wüstite
A variety of Minerals
What is Wüstite?
Wüstite (FeO) is a mineral form of iron(II) oxide found with meteorites and native iron. It has a grey colour with a greenish tint in reflected light. Wüstite crystallizes in the isometric-hexoctahedral crystal system in opaque to translucent metallic grains. It has a Mohs hardness of 5 to 5.5 and a specific gravity of 5.88. Wüstite is a typical example of a non-stoichiometric compound. Wüstite was named for Fritz Wüst (1860–1938), a German metallurgist and founding director of the Kaiser-Wilhelm-Institut für Eisenforschung (presently Max Planck Institute for Iron Research GmbH). In addition to the type locality in Germany, it has been reported from Disko Island, Greenland; the Jharia coalfield, Jharkhand, India and as inclusions in diamonds in a number of kimberlite pipes. It also is reported from deep sea manganese nodules. Its presence indicates a highly reducing environment.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Wüstite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Wüstite Localities Map
See where Wüstite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Black
- Hardness (Mohs)
- 5 - 5.5
Chemical Properties
- Chemical Formula
- FeO
- Elements
- Fe, O
Also Known As
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Wüstite FAQs
How do I identify Wüstite?
Wüstite can be identified by its hardness of 5 - 5.5 on the Mohs scale, Black color. Look for these key characteristics when examining specimens.
What color is Wüstite?
Wüstite typically appears in Black. Color can vary depending on impurities and formation conditions.
How hard is Wüstite?
Wüstite has a hardness of 5 - 5.5 on the Mohs scale. This gives it moderate hardness.
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