Occurrences of Pd–Pt Bismuthotellurides and a Phosphohedyphane-Like Phase in Sulfide Veins of the Monchepluton Layered Complex, Kola Peninsula, Russia

We describe occurrences of platinum-group minerals (PGM) and an uncommon mineral enriched in Cl, provide a brief review Cl-bearing associated with basic–ultrabasic complexes. An unusual phosphohedyphane-like phase (~30 µm), close to CaPb4(PO4)3Cl, occurs one the PGM-bearing veins massive sulfides Monchepluton layered complex, Kola Peninsula, Russia. These consist varying amounts pyrrhotite, pentlandite, chalcopyrite, pyrite accessory grains galena; they are fairly abundant heavy-mineral concentrate, as small (<0.1 mm) PGM: michenerite, sperrylite, Bi-enriched members merenskyite–moncheite series kotulskite, also rich Bi. The PGE mineralization is attributed low-temperature deposition at hydrothermal stage. pyromorphite–phosphohedyphane solid solution likely formed secondary under conditions progressive build-up oxygen fugacity via oxidation reactions precursor grain galena involving Ca, incompatible component sulfides, medium residual fluid Cl.