Anyuiite
Anyuiite is an IMA-recognized mineral species in the native element class, with the chemical formula AuPb₂.
It crystallizes in the tetragonal crystal system (space group I4/mcm). It is a member of the Khatyrkite structural group.
Key properties: specific gravity 13.49; Metallic luster.
IMA symbol Any, IMA status: approved, named in 1987.
Found in placer concentrates derived from small ultramafic-gabbroid masses in a dunite-harzburgite formation (Bol’shoi Anyui River basin, Russia); in gold concentrates from placers (Hunchun River, China).
It is found associated with Lead, gold, ilmenite, titanian magnetite, chrome spinel, hematite, pyrite, chalcopyrite, apatite (Bol’shoi Anyui River basin, Russia); gold, lead, hunchinite.
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia.