petzite
noun
petz·ite
ˈpetˌsīt
plural -s
: a mineral Ag3 Au Te2 consisting of a silver gold telluride that is steel gray to iron black (hardness 2.5–3, specific gravity 8.7–9.0)
Word History
Etymology
German petzit, from W.K.Pecz †1873 Hungarian geologist who analyzed it + German -it -ite