Post by shadow on Apr 27, 2014 16:51:05 GMT -5
Ohemical Formula: AuTe2 (Usually contains a little silver) 44% Gold by weight
Colors: Silver-white or bronzy yellow in color and has a yellow-gray or greenish gray streak. Its surface is frequently covered with a yellow tarnish.
Hardness: 2 to 3
Hardness varies somewhat depending on formation and impurities.
Density: 9.4
The density is high because of the large gold content.
Occurrence, Localities and Origins:
The mineral occurs in veins with the other tellurides associated with gold ores in Calaveras Co., California in the Stanislaus Mine, where it was first recognized. Calaverite and other associated gold and silver telluride minerals are important sources of silver and gold in the mines at Nagyag, Transylvania, at Cripple Creek and in Boulder Co., Colo., and at Kalgoorlie, W. Australia.
It is believed to have been deposited by ascending magmatic water at comparatively low temperatures. Other rare tellurides belonging to this group are, sylvanite, hessite (Ag2Te) and petzite (Au,Ag2Te), krennerite, AuTe2 , and nagyagite, a sulpho-telluride of lead and gold. Historically, calaverite has been as important ore of gold.
Colors: Silver-white or bronzy yellow in color and has a yellow-gray or greenish gray streak. Its surface is frequently covered with a yellow tarnish.
Hardness: 2 to 3
Hardness varies somewhat depending on formation and impurities.
Density: 9.4
The density is high because of the large gold content.
Occurrence, Localities and Origins:
The mineral occurs in veins with the other tellurides associated with gold ores in Calaveras Co., California in the Stanislaus Mine, where it was first recognized. Calaverite and other associated gold and silver telluride minerals are important sources of silver and gold in the mines at Nagyag, Transylvania, at Cripple Creek and in Boulder Co., Colo., and at Kalgoorlie, W. Australia.
It is believed to have been deposited by ascending magmatic water at comparatively low temperatures. Other rare tellurides belonging to this group are, sylvanite, hessite (Ag2Te) and petzite (Au,Ag2Te), krennerite, AuTe2 , and nagyagite, a sulpho-telluride of lead and gold. Historically, calaverite has been as important ore of gold.
