Microinclusions of the extremely rare Pt-Sb mineral genkinite in a nugget of isoferroplatinum in an analyzed specimen by SEM/EDS, from the type locality in Southafrica: Onverwacht Mine, Steelpoort, Sekhukhune District, Limpopo Province, South Africa. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Genkinite
Genkinite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Pt₄Sb₃.
It crystallizes in the tetragonal crystal system.
Key properties: specific gravity 9.256.
IMA symbol Gki, IMA status: approved, named in 1976.
Found in ultramafics or ophiolites mineralized with Pt–Fe–Cu–Ni, and placers derived from them.
It is found associated with Sperrylite, platarsite, ruthenarsenite, stibiopalladinite, mertieite-II, Pt–Fe alloy, chromite (Onverwacht mine, South Africa); osmium, Pt–Pd–Cu alloy.
The name refers to Dr. Alexandr D. Genkin (1919–), Russian mineralogist specializing in platinum group elements.