The exploration for precious metals in natural sources led to the discovery of Ag 3 AuSe 2 (fischesserite) and Ag 3 AuTe 2 (petzite) in the nature in the early 1900s. They were identified to have stoichiometric compositions and share the chiral cubic I4 1 32 space group, as determined by X-ray diffraction. Ag 3 AuS 2 crystallizes in a centrosymmetric trigonal structure and is not the focus of this study.