Eskimoite , Gustavite Locality: Bockhart reservoir (Pochkar reservoir), Siglitz - Bockhart area, Gastein valley, Hohe Tauern Mts, Salzburg , Austria ( Locality at mindat.org ) Size: 3.8 x 2.4 x 1.3 cm. An extremely rich example of this silver, lead, bismuth sulfide in crystals to 0.2 mm embedded in the matrix and intimately associated with gustavite. There may be other minerals present such as Vikingite, Ourayite, Schirmerite, and Treasurite. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Eskimoite
Eskimoite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ag₇Pb₁₀Bi₁₅S₃₆.
It crystallizes in the monoclinic crystal system. It is a member of the Lillianite structural group.
Key properties: specific gravity 7.12.
IMA symbol Ekm, IMA status: approved, named in 1976.
Found in a cryolite deposit (Ivigtut, Greenland).
It is found associated with Berryite, aikinite, galena (Ivigtut, Greenland); pyrite, enargite (Flathead mine, Montana, USA).
The name refers to the Eskimos, early settlers of Greenland.