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
Common impurities: Sb,Pb,Cu,Ni
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
Associated minerals include gold, calaverite,
chalcedony and fluorite
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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