Weissite
A variety of Minerals
What is Weissite?
Weissite is a telluride mineral, a copper telluride. Its chemical formula is Cu2−xTe. Weissite has hexagonal crystal structure. Its specific gravity is 6 and its Mohs hardness is 3. Occurrence is in Gunnison County, Colorado, Arizona and New Mexico in the United States. It is also reported from Kalgoorlie, Western Australia and Dalarna and Värmland, Sweden. Weissite occurs in hydrothermal deposits associated with pyrite, native tellurium, sylvanite, petzite, rickardite, native sulfur, native gold, calaverite and krennerite. It was first described in 1927 for an occurrence in the Good Hope Mine in the Vulcan District of Gunnison County, Colorado. It was named for mine owner Louis Weiss.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Weissite 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.
Weissite Localities Map
See where Weissite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Bluish black, black (tarnished)
- Hardness (Mohs)
- 3
- Streak
- Black
Chemical Properties
- Chemical Formula
- Cu2-xTe Previously given as Cu5Te3.
- Elements
- Cu, Te
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Weissite FAQs
How do I identify Weissite?
Weissite can be identified by its hardness of 3 on the Mohs scale, Bluish black color. Look for these key characteristics when examining specimens.
What color is Weissite?
Weissite typically appears in Bluish black, black (tarnished). Color can vary depending on impurities and formation conditions.
How hard is Weissite?
Weissite has a hardness of 3 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
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