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 a platinum cupride–stannide mineral (PCSM) of composition Pt(Cu0.67Sn0.33). It occurs in a placer deposit in the River Bolshoy Khailyk, southern Krasnoyarskiy kray, Russia. A synthetic equivalent of PCSM was obtai...

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Autores principales:	Andrei Y. Barkov, Luca Bindi, Erick A. Juárez-Arellano, Nobumichi Tamura, Gennadiy I. Shvedov, Chi Ma, Robert F. Martin
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ternary Pt–Cu–Sn phase intermetallic compounds and alloys platinum-group minerals PGE–Cu–Au mineralization ophiolite complexes placer deposits Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/71872155fdad497d9c9b55fb62614575
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spelling	oai:doaj.org-article:71872155fdad497d9c9b55fb626145752021-11-25T18:26:31ZUnnamed 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 Solutions10.3390/min111112402075-163Xhttps://doaj.org/article/71872155fdad497d9c9b55fb626145752021-11-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1240https://doaj.org/toc/2075-163XWe 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.Andrei Y. BarkovLuca BindiErick A. Juárez-ArellanoNobumichi TamuraGennadiy I. ShvedovChi MaRobert F. MartinMDPI AGarticleternary Pt–Cu–Sn phaseintermetallic compounds and alloysplatinum-group mineralsPGE–Cu–Au mineralizationophiolite complexesplacer depositsMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1240, p 1240 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ternary Pt–Cu–Sn phase intermetallic compounds and alloys platinum-group minerals PGE–Cu–Au mineralization ophiolite complexes placer deposits Mineralogy QE351-399.2
spellingShingle	ternary Pt–Cu–Sn phase intermetallic compounds and alloys platinum-group minerals PGE–Cu–Au mineralization ophiolite complexes placer deposits Mineralogy QE351-399.2 Andrei Y. Barkov Luca Bindi Erick A. Juárez-Arellano Nobumichi Tamura Gennadiy I. Shvedov Chi Ma Robert F. Martin 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
description	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.
format	article
author	Andrei Y. Barkov Luca Bindi Erick A. Juárez-Arellano Nobumichi Tamura Gennadiy I. Shvedov Chi Ma Robert F. Martin
author_facet	Andrei Y. Barkov Luca Bindi Erick A. Juárez-Arellano Nobumichi Tamura Gennadiy I. Shvedov Chi Ma Robert F. Martin
author_sort	Andrei Y. Barkov
title	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
title_short	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
title_full	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
title_fullStr	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
title_full_unstemmed	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
title_sort	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
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/71872155fdad497d9c9b55fb62614575
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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

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