Some new platinoid-rich minerals, identified with the electron microanalyser (Plate XVII)

Abstract

Summary Minerals approximating to the formulae PtSb 2 , PtSb, Pt(Sb,Bi), (Pt,Ir)As 2 , Pt(Ir,Os) 2 As 4 , Pd 2 CuSb, Pd(Sb,Bi), Pd 8 CuSb 3 , Pt 4 Sn 3 Cu 4 , and (Fe,Ni) 2 S have been discovered as fine intergrowths in platinum concentrates from the Driekop mine, Transvaal, South Africa. Conventional ore microscopy also proved the presence of most of the known minerals of the platinum paragenesis. The name geversite is proposed for the phase PtSb 2 .