Unnamed Pt(Cu0.67Sn0.33) from the Bolshoy Khailyk River, Western Sayans, Russia, and a Review of Related Compounds and Solid Solutions

We describe a potentially new species of platinum cupride–stannide mineral (PCSM) composition Pt(Cu0.67Sn0.33). It occurs in placer deposit the River Bolshoy Khailyk, southern Krasnoyarskiy kray, Russia. A synthetic equivalent PCSM was obtained and characterized. The as anhedral or subhedral grains up to 15 μm × 30 association with various platinum-group minerals, Rh–Co-rich pentlandite magnetite, all hosted by grain Cu–Au–Pt alloy. Synchrotron micro-Laue diffraction studies indicate that is tetragonal belongs inferred space-group P4/mmm (#123). Its unit-cell parameters are = 2.838 (3) Å, c 3.650 (4) V 29.40 (10) Å3, Z 1. c:a ratio calculated from 1.286. These characteristics good agreement those for specimens review on related minerals unnamed phases provided outline compositional variations extents solid solutions relevant systems PtNi–PtFe–PtCu, PdCu–PdHg–PdAu, PdHg–PtHg, AuCu–PtCu. PCSM-bearing mineralization appears be genetically an ophiolitic source-rock Aktovrakskiy complex western Sayans. phase likely crystallized microvolumes highly fractionated melt rich Cu Sn.