Minerals
Montbrayite
montbrayite
(Au,Ag,Sb,Bi,Pb)23(Te,Sb,Bi,Pb)38
Montbrayite: Mineral information, data and localities. — via www.mindat.org · Source
Overview
Montbrayite (from a Canadian toponym) is a very rare mineral from among the gold tellurides, close to krennerite and calaverite, in composition it is a mixed polymetallic plumbo-telluride of gold with a variable formula, initially written as Au2Te3, or (Au,Sb)2Te3, but today having a much more complex form in the calculated form: (Au,Ag,Sb,Bi,Pb)23(Te,Sb,Bi,Pb)38. The color of montbrayite is cream, tin-white to pale yellow, the luster is metallic.