Formula: AgAuTe4 telluride
Specific gravity: 8.0 - 8.3
Hardness: 1½ to 2
Streak: Grey
Colour: Silver-grey, whitish
Solubility: Insoluble in water, hydrochloric and sulphuric acid; slightly soluble in nitric acid

Hydrothermal environments

Sylvanite occurs in epithermal (low temperature) hydrothermal veins.

At Cobar, New South Wales, Australia, sylvanite is a minor ore mineral (AJM 11.2.69)

At Cripple Creek, Colorado, USA, sylvanite is found associated with calaverite and krennerite, and sometimes pseudomorphed by gold (MinRec 36.2.179).

Common impurities: Sb,Pb,Cu,Ni

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