Calvertite
A variety of Minerals
What is Calvertite?
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Calvertite 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.
Quick Facts
Physical Properties
- Color
- Black
- Hardness (Mohs)
- 4 - 5
- Rock tumbling
- Not recommended
- Density
- 5.239 g/cm³
- Streak
- Black
Chemical Properties
- Chemical Formula
- Cu5Ge0.5S4
- Elements
- Cu, Ge, S
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Calvertite FAQs
How do I identify Calvertite?
Calvertite can be identified by its hardness of 4 - 5 on the Mohs scale, Black color. Look for these key characteristics when examining specimens.
What color is Calvertite?
Calvertite typically appears in Black. Color can vary depending on impurities and formation conditions.
How hard is Calvertite?
Calvertite has a hardness of 4 - 5 on the Mohs scale. This gives it moderate hardness.
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