They include calaverite, sylvanite, nagyagite, petzite and krennerite.
2.
Gold sometimes occurs combined with tellurium as the minerals calaverite, krennerite, nagyagite, petzite and sylvanite ( see telluride minerals ), and as the rare bismuthide maldonite ( Au 2 Bi ) and antimonide aurostibite ( AuSb 2 ).
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