1) Gold mineral 2) Monoclinic mineral 
Calaverite, or gold telluride, is an uncommon telluride of gold, a metallic mineral with the chemical formula AuTe2, with approximately 3% of the gold replaced by silver. It was first discovered in Calaveras County, California in 1861, and was named for the county in 1868. The mineral often has a metallic luster, and its color may range from a sil...
• (n.) A bronze-yellow massive mineral with metallic luster; a telluride of gold; -- first found in Calaveras County California.
a gold telluride mineral (AuTe2) that is a member of the krennerite group of sulfides and perhaps a structurally altered form (paramorph) of ...
Ca`la·ve'rite noun (Min.) A bronze-yellow massive mineral with metallic luster; a telluride of gold; -- first found in Calaveras County California. 
Calaverite is a bronze-yellow massive mineral with metallic lustre; a telluride of gold. It was first found in Calaveras County, California.