krennerite

a gold mineral that usually occurs in veins formed at low temperatures, as at Kalgoorlie, Australia, and Cripple Creek, Colo., U.S. A gold telluride ...
Found on http://www.britannica.com/eb/a-z/k/52

Krennerite

Krennerite is an orthorhombic gold telluride mineral which can contain a relatively small amount of silver in the structure. The formula is AuTe2 varying to (Au0.8,Ag0.2)Te2. Both of the chemically similar gold-silver tellurides, calaverite and sylvanite, are in the monoclinic crystal system, whereas krennerite is orthorhombic. The color varies fr...
Found on http://en.wikipedia.org/wiki/Krennerite
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