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- W1978739745 abstract "Abstract Silver-bearing zinc-iron tetrahedrite-tennantite and freibergit fahlores approximating the simplified formula (Ag,Cu) 10 (Fe,Zn) 2 (As,Sb) 4 S 13 have been equilibrated with excess electrum (Au x Ag 1− x ) and chalcopyrite + pyrite + iron-bearing sphalerite (CuFeS 2 + FeS 2 + Fe 0.05 Zn 0.95 S) in evacuated silica tubes at 300 °C, in reversed silver-copper exchange experiments with less than 0.1 mg NH 4 Cl added as a transport medium. A thermodynamic formulation and parameters describing As-Ag incompatibility at 400 °C (Ebel and Sack, 1989), which incorporate large temperature dependencies of standard-state properties and composition-ordering systematics, are shown to apply equally well to these 300 °C results. A generalised graphical model for this mineral assemblage is presented, describing fahlore composition as a function of temperature and the compositions of coexisting electrum and (Fe,Zn)S, which define the Ag(Cu) −1 and Fe(Zn) −1 exchange properties controlling fahlore compositions." @default.
- W1978739745 created "2016-06-24" @default.
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- W1978739745 date "1991-12-01" @default.
- W1978739745 modified "2023-10-16" @default.
- W1978739745 title "Arsenic-silver incompatibility in fahlore" @default.
- W1978739745 cites W1535539135 @default.
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- W1978739745 doi "https://doi.org/10.1180/minmag.1991.055.381.04" @default.
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