Domeykite
A variety of Minerals
What is Domeykite?
Domeykite is a copper arsenide mineral, Cu3As. It crystallizes in the isometric system, although crystals are very rare. It typically forms as irregular masses or botryoidal forms. It is an opaque, white to gray (weathers brassy) metallic mineral with a Mohs hardness of 3 to 3.5 and a specific gravity of 7.2 to 8.1 It was first described in 1845 in the Algodones mines, Coquimbo, Chile. It was named after Polish mineralogist Ignacy Domeyko (1802–1889) by Wilhelm Haidinger.
Uses & Applications
Domeykite, being a minor copper ore is used for obtaining copper. It can also be polished and used for ornamental purposes.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Domeykite 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.
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Quick Facts
Physical Properties
- Color
- Tin white - steel grey
- Hardness (Mohs)
- 3 - 3.5
- Rock tumbling
- Not recommended
- Density
- 7.86 g/cm³
Chemical Properties
- Chemical Formula
- Cu3As
- Elements
- As, Cu
Also Known As
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Domeykite FAQs
How do I identify Domeykite?
Domeykite can be identified by its hardness of 3 - 3.5 on the Mohs scale, Tin white - steel grey color. Look for these key characteristics when examining specimens.
What color is Domeykite?
Domeykite typically appears in Tin white - steel grey. Color can vary depending on impurities and formation conditions.
How hard is Domeykite?
Domeykite has a hardness of 3 - 3.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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