| Reference Type | Journal (article/letter/editorial) |
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| Title | Arsenic-silver incompatibility in fahlore |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Ebel, Denton S. | Author |
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| Sack, Richard O. | Author |
| Year | 1991 (December) | Volume | 55 |
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| Issue | 381 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_55/55-381-521.pdf+ |
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| DOI | doi:10.1180/minmag.1991.055.381.04Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1762 | Long-form Identifier | mindat:1:5:1762:0 |
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| GUID | 0 |
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| Full Reference | Ebel, Denton S., Sack, Richard O. (1991) Arsenic-silver incompatibility in fahlore. Mineralogical Magazine, 55 (381) 521-528 doi:10.1180/minmag.1991.055.381.04 |
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| Plain Text | Ebel, Denton S., Sack, Richard O. (1991) Arsenic-silver incompatibility in fahlore. Mineralogical Magazine, 55 (381) 521-528 doi:10.1180/minmag.1991.055.381.04 |
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| In | (1991, December) Mineralogical Magazine Vol. 55 (381) Mineralogical Society |
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| Abstract/Notes | AbstractSilver-bearing zinc-iron tetrahedrite-tennantite and freibergit fahlores approximating the simplified formula (Ag,Cu)10(Fe,Zn)2(As,Sb)4S13 have been equilibrated with excess electrum (AuxAg1−x) and chalcopyrite + pyrite + iron-bearing sphalerite (CuFeS2 + FeS2 + Fe0.05Zn0.95S) in evacuated silica tubes at 300 °C, in reversed silver-copper exchange experiments with less than 0.1 mg NH4Cl 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. |
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