Structural and chemical study of weishanite, (Au,Ag,Hg), from the Keystone mine, Colorado, USA
| Autor: | Luca Bindi, Giovanni Orazio Lepore, Frank N. Keutsch |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
crystal structure
Materials science mercury gold-silver alloys Alloy nomenclature rules Analytical chemistry chemistry.chemical_element Zinc Electron microprobe Crystal structure engineering.material gold amalgam 010502 geochemistry & geophysics 010403 inorganic & nuclear chemistry 01 natural sciences 0104 chemical sciences Critical discussion weishanite chemistry Geochemistry and Petrology engineering silver 0105 earth and related environmental sciences |
| Zdroj: | Mineralogical magazine (Online) 82 (2018): 1141–1145. doi:10.1180/mgm.2018.113 info:cnr-pdr/source/autori:Bindi L.; Keutsch F.N.; Lepore G.O./titolo:Structural and chemical study of weishanite, (Au,Ag,Hg), from the Keystone mine, Colorado, USA/doi:10.1180%2Fmgm.2018.113/rivista:Mineralogical magazine (Online)/anno:2018/pagina_da:1141/pagina_a:1145/intervallo_pagine:1141–1145/volume:82 |
| Popis: | Structural data for weishanite, an alloy of Au, Ag and Hg, were collected for the first time from a crystal from the Keystone Mine, Colorado, USA. The structure was solved in the space group P63/mmc with the unit cell a = 2.9348(8) and c = 4.8215(18) Å] and refined to R = 0.0299 for 40 observed reflections [4σ(F) level] and four parameters and to R = 0.0356 for all 47 independent reflections. The weishanite structure can be considered a derivative of the zinc structure, with Au, Ag and Hg disordered in the same structural position. On this basis, we suggest that the formula is normalized to 1 atom with Z = 2, leading, for the sample investigated, to Au0.41Ag0.31Hg0.28 (electron microprobe data). Accordingly, weishanite can be considered the Au-rich isotype of schachnerite. A comparison with other Au/Ag-Hg alloys is presented together with a critical discussion about the nomenclature rules to be applied to alloys and simple metals. |
| Databáze: | OpenAIRE |
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