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The system Ag–Pd–Te: phase relations and mineral assemblages

Published online by Cambridge University Press:  02 January 2018

Anna Vymazalová
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic
František Laufek
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic
Alexandr V. Kristavchuk
Affiliation:
Institute of Experimental Mineralogy RAS, 142 432 Chernogolovka, Russia University of Dubna, Universitetskaja 19, 141 980 Dubna, Russia
Dmitriy A. Chareev
Affiliation:
Institute of Experimental Mineralogy RAS, 142 432 Chernogolovka, Russia
Milan Drábek
Affiliation:
Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic
Corresponding

Abstract

The phase equilibria in the system Ag–Pd–Te were studied by the technique of using an evacuated silica glass tube at 350° and 450°C. Five ternary phases were synthesized: sopcheite (Pd3Ag4Te4), lukkulaisvaaraite (Pd14Ag2Te9),telargpalite (Pd2–x Ag1+x Te) and the previously unknown phases Pd7.5–x Ag0.5+ x Te3 and Pd2+x Ag2–x Te.The synthetic telargpalite has a compositional range from 26 to 29 wt.% Ag, with the formula Pd2–xAg1+x Te, where x varies from 0.09 to 0.22. The phase Pd2+x Ag2–x Te has a compositional range from 34 to 35 wt.% Ag, where x varies from 0.18 to 0.24. The phase Pd7.5–x Ag0.5+x Te3 forms a solid solution from 4 to 11 wt.% Ag, where x varies from 0.02 to 0.83. Phases Pd20Te7and Pd13Te3 dissolve up to 3.5 and 2 wt.% Ag, respectively. Other binary palladium tellurides do not dissolve Ag. The phase Pd3Ag4Te4, an analogue of the mineral sopcheite, forms a stable association with hessite and kotulskite it also coexists with lukkulaisvaaraite. Sopcheite is stable up to 383°C. Natural occurrences of hessite, kotulskite and lukkulaisvaaraite together in equilibrium indicate formation above this temperature. Phase relations defined the mineral assemblages that can be expected to occur in nature.The phase Pd7.5–x Ag0.5+x Te3 potentially represents a new mineral; it will probably be found in association with lukkulaisvaaraite and telargpalite or telluropalladinite, among other platinum-group minerals. The phasePd2+x Ag2–x Te can be found in association with telargpalite. Mineral assemblages defined in this study can be expected in Cu-Ni-PGE mineral deposits, associated with mafic and ultramafic igneous rocks, particularly in mineralized zones with known silver-palladium tellurides.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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