(Min.) A mineral of blackish lead-gray color and metallic luster, generally of a foliated massive structure; foliated tellurium. It is a telluride of lead and gold.
nagyagite
nagyagite
[′nag·yə‚jīt] (mineralogy) Pb5 Au(Te,Sb)4S5-8A lead-gray mineral consisting of a sulfide of lead, gold, tellurium, and antimony. Also known as black tellurium; tellurium glance.