Unnamed Pt(Cu<sub>0.67</sub>Sn<sub>0.33</sub>) from the Bolshoy Khailyk River, Western Sayans, Russia, and a Review of Related Compounds and Solid Solutions
We describe a potentially new species of a platinum cupride–stannide mineral (PCSM) of composition Pt(Cu<sub>0.67</sub>Sn<sub>0.33</sub>). It occurs in a placer deposit in the River Bolshoy Khailyk, southern Krasnoyarskiy kray, Russia. A synthetic equivalent of PCSM was obtai...
Guardado en:
| Autores principales: | , , , , , , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/71872155fdad497d9c9b55fb62614575 |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| Sumario: | We describe a potentially new species of a platinum cupride–stannide mineral (PCSM) of composition Pt(Cu<sub>0.67</sub>Sn<sub>0.33</sub>). It occurs in a placer deposit in the River Bolshoy Khailyk, southern Krasnoyarskiy kray, Russia. A synthetic equivalent of PCSM was obtained and characterized. The PCSM occurs as anhedral or subhedral grains up to 15 μm × 30 μm in association with various platinum-group minerals, Rh–Co-rich pentlandite and magnetite, all hosted by a placer grain of Cu–Au–Pt alloy. Synchrotron micro-Laue diffraction studies indicate that the PCSM mineral is tetragonal and belongs to the inferred space-group <i>P</i>4/<i>mmm</i> (#123). Its unit-cell parameters are <i>a</i> = 2.838 (3) Å, <i>c =</i> 3.650 (4) Å, and <i>V</i> = 29.40 (10) Å<sup>3</sup>, and Z = 1. The <i>c:a</i> ratio calculated from the unit-cell parameters is 1.286. These characteristics are in good agreement with those obtained for specimens of synthetic Pt(Cu<sub>0.67</sub>Sn<sub>0.33</sub>). A review on related minerals and unnamed phases is provided to outline compositional variations and extents of solid solutions in the relevant systems PtNi–PtFe–PtCu, PdCu–PdHg–PdAu, PdHg–PtHg, and AuCu–PtCu. The PCSM-bearing mineralization appears to be related genetically with an ophiolitic source-rock of the Aktovrakskiy complex of the western Sayans. The unnamed phase likely crystallized from microvolumes of a highly fractionated melt rich in Cu and Sn. |
|---|