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Category Selenide mineral
(repeating unit)
Strunz classification 2.CB.05a
Crystal system Cubic
Crystal class Hextetrahedral (43m)
H-M symbol: (4 3m)
Space group F43m
Unit cell a = 5.667 Å; Z = 4
Color Gray
Mohs scale hardness 5
Luster Metallic
Diaphaneity Opaque to translucent
Specific gravity 5.42
Optical properties Isotropic
Refractive index About 2.5
References [1][2]

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).[3]

It has been reported from the Santa Brigida mine, La Rioja Province, Argentina and from Tilkerode (Abberode) in the Harz Mountains, Germany.[1] 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.[1]

See also[edit]