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The Canadian Mineralogist; December 2006; v. 44; no. 6; p. 1499-1512; DOI: 10.2113/gscanmin.44.6.1499
© 2006 Mineralogical Association of Canada
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Articles

THE CRYSTAL STRUCTURE OF DADSONITE

Emil Makovicky1,§, Dan Topa2 and William G. Mumme3

1 Geological Institute, University of Copenhagen, Østervoldgade 10, DK–1350 Copenhagen K, Denmark
2 Department of Material Science, University of Salzburg, Hellbrunnerstr. 34, A–5020 Salzburg, Austria
3 CSIRO Minerals, Bayview Avenue, Clayton 3168, Australia

§ E-mail address: emilm{at}geol.ku.dk

Nous avons affiné la structure cristalline de la dadsonite, de composition idéale Pb23Sb25S60Cl, a 8.276(2), b 17.392(4), c 19.505(4) Å, {alpha} 83.527(7), ß 77.882(8), {gamma} 89.125(8)°, V 2727.2(9) Å3, groupe spatial PFormula et Z = 1, provenant du gisement hydrothermal de Klacianka, dans les montagnes bas Tatra de Slovaquie, jusqu’à un résidu R1 de 4.90% en utilisant 5263 réflexions uniques [Fo 2 ≥ 2{sigma}(F2)] mesurées avec rayonnement MoK{alpha} sur un diffractomètre à trois cercles muni d’un détecteur de type CCD. La structure contient dix sites occupés entièrement par Pb et huit sites à Sb, ainsi que trois sites à occupation mixte (Pb,Sb) et (Sb,Pb), et trois sites ayant une coordinence partagée de Sb. Trente positions de S et une position présumée de Cl, désignée "S1", constituent la partie anionique de la structure. Cette structure, du type "bâtonnets en couches", comporte deux sortes de ces agencements en alternance le long de la direction d’empilement b. La dadsonite aurait une structure OD dissymétrisée avec maclage répandu. Les deux sortes de couches ont une symétrie pFormula et b2/m11, respectivement. Ces couches possèdent à la fois une pseudopériodicité égale à a/2 et un ensemble d’éléments de pseudosymétrie qui ensemble causent un processus de désordre.

(Traduit par la Rédaction)

Mots-clés: dadsonite, sulfosel Pb–Sb, structure cristalline, chlorosulfure.




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