Stilleite
A variety of Minerals
What is Stilleite?
Stilleite is a selenide mineral, zinc selenide, with the formula ZnSe. It has been found only as microscopic gray crystals occurring as inclusions in linnaeite associated with other selenide and sulfides. It was originally discovered in Katanga Province, Zaire in 1956 and is named for the German geologist, Hans Stille (1876–1966). It has been reported from the Santa Brigida mine, La Rioja Province, Argentina and from Tilkerode (Abberode) in the Harz Mountains, Germany. Associated minerals include pyrite, linnaeite, clausthalite, selenian vaesite, molybdenite and dolomite in the Shinkolobwe region of the Congo); and with tiemannite, clausthalite, eucairite, umangite, klockmannite in the Santa Brigida mine, Argentina.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Stilleite 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.
Stilleite Localities Map
See where Stilleite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Gray
- Hardness (Mohs)
- 5
- Density
- 5.267 g/cm³
Chemical Properties
- Chemical Formula
- ZnSe
- Elements
- Se, Zn
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Stilleite FAQs
How do I identify Stilleite?
Stilleite can be identified by its hardness of 5 on the Mohs scale, Gray color. Look for these key characteristics when examining specimens.
What color is Stilleite?
Stilleite typically appears in Gray. Color can vary depending on impurities and formation conditions.
How hard is Stilleite?
Stilleite has a hardness of 5 on the Mohs scale. This gives it moderate hardness.
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