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Bindi, L., Evain, M., Spry, P. G., Tait, K. T. & Menchetti, S. (2007) Structural role of copper in the minerals of the pearceite-polybasite group: the case of the new minerals cupropearceite and cupropolybasite. Mineral. Mag. 71 641–650. 
Added by: Laurent Cournède (2016-03-10 22:02:28)
Type de référence: Article
DOI: 10.1180/minmag.2007.071.6.641
Numéro d'identification (ISBN etc.): 0026-461X
Clé BibTeX: Bindi2007a
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Catégories: MIOPS
Mots-clés: chemical composition, crystal structure, crystal-structure, cupropearceite, cupropolybasite, disorder, new mineral, polytypism
Créateurs: Bindi, Evain, Menchetti, Spry, Tait
Collection: Mineral. Mag.
Consultations : 10/421
Indice de consultation : 1%
Indice de popularité : 0.25%
Résumé     
{The pearceite-polybasite group of minerals, general formula [M6T2S7][Ag9CuS4] with M = Ag, Cu; and T = As, Sb, show a crystal structure which can be described as the succession, along the c axis, of two pseudo-layer modules: a [M6T2S7](2-) A module layer and a [Ag9CUS4](2+) B module layer. Copper is present in one structural position of the B module layer and replaces Ag in the only fully occupied M position of the A module layer. When the Cu content is {>}4.00 a.p.f.u., the structural position of the A module layer becomes Cu-dominant and, consequently, the mineral deserves its own name. In this paper we report the crystal-chemical characterization of two Cu-rich members exhibiting the 111 unit-cell type (corresponding to the Tac polytype). One sample (space group P (3) over bar m1, a 7.3218(8), c 11.8877(13) angstrom, V 551.90(10) angstrom(3)) having As {>}Sb and with the structural position of the A module layer dominated by Cu, has been named cupropearceite and the other sample (space group P (3) over bar m1, a 7.3277(3), c 11.7752(6) angstrom, V 547.56(8) angstrom(3)
Added by: Laurent Cournède  
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