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Kostovite: CuAuTe4
Comments: B&W, oil immersion, XPL image of a twinned grain of kostovite surrounded by native tellurium (Te), chalcopyrite (Cp), Tennantite (Tn) and barite (Ba). (AmMin, v51:29). Location: Chelopech copper deposit, Bulgaria. Scale: Magnification 1,000 X. © American Mineralogist
Comments: Dark gray metallic fragment of kostovite embedded in epoxy. Location: Chelopech Mine, Chelopech Obshchina, Balkan Mts (Stara-Planina Mts), Sofiya (Sofia) Oblast, Bulgaria. Scale: See Image. © Rruff Database