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The Canadian Mineralogist; October 2001; v. 39; no. 5; p. 1365-1376; DOI: 10.2113/gscanmin.39.5.1365
© 2001 Mineralogical Association of Canada
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THE CRYSTAL STRUCTURE OF NEYITE, Ag2Cu6Pb25Bi26S68

Emil Makovicky§, Tonci Balic-Zunic and Dan Topa

Department of Mineralogy, Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark

§ E-mail address: emilm{at}geo.geol.ku.dk

Nous avons déterminé la structure cristalline de la neyite provenant de la localité-type, Alice Arm, en Colombie-Britannique, à partir de données en diffraction X prélevées sur cristal unique, jusqu’à un résidu R1 = 0.037 (0.072 pour toutes les réflexions) et {omega}R2 = 0.078. La formule structurale qui répond aux nouvelles données de microsonde électronique est AgCu3Pb12.5Bi13S34 (Z = 4); les paramètres réticulaires sont a 37.527(6), b 4.0705(6), c 43.701(7) Å, ß 108.801(2)°, groupe spatial C2/m. La structure contient 26 polyèdres contenant un cation à large rayon, un site Ag et trois sites occupés par le Cu. On peut la décrire en termes d’une alternance de couches ressemblant à (111)PbS à multiples de trois octaèdres et des couches ressemblant à (100)PbS ayant une épaisseur de deux plans d’atomes. Les deux séries de couches sont (a) cisaillées, ce qui donne des sites tétraédriques occupés par le Cu, et (b) terminées par des couches ondulantes ressemblant au PbS le long de (001)ney, d’une épaisseur de trois plans d’atomes. On décrit la structure qui en résulte comme un agencement en boîtes de couches ressemblant à (100)PbS et renfermant des fragments de couches rappelant (111)PbS. Nous dérivons plusieurs structures hypothétiques à partir du principe de la neyite.

(Traduit par la Rédaction)

Mots-clés: neyite, structure cristalline, sulfosel, Alice Arm, Colombie-Britannique.




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