Sylvanite

sylvanite

calaverite

krennerite

petzite

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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
Common impurities: Sb,Pb,Cu,Ni
Environments:

Hydrothermal environments

Sylvanite occurs most commonly in low-temperature hydrothermal veins, but also in moderate and high temperature deposits; it is usually among the last minerals formed (Webmin). Associated minerals include gold, calaverite, krennerite, altaite, hessite, petzite, acanthite, pyrite, galena, sphalerite, chalcopyrite, quartz, chalcedony and fluorite (HOM).

Localities

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

The type locality is Baia de Arieș, Alba, Romania.

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

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