Mined in Australia in the East Kalgoorlie district.

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Article codeII.D.1620.001
Thumbnail (1,0x0,5 inch) - Sylvanite is a gold and silver telluride mineral - Old sample Sydney Univ.
A silver-white to steel-gray mineral with a brilliant metallic luster.
Everybody knows pure gold, but gold also occurs in compounds of gold and/or silver with tellurium. The tellurides, calaverite and sylvanite are mined for their gold content.
Sylvanite is found and mined in Australia in the East Kalgoorlie district and a few other places.
Kalgoorlie is known for its rather clunky though rich specimens of essentially massive gold tellurides associated with coarse native gold.