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