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- W2009710905 abstract "Nous avons affine la structure cristalline de la senkevichite, de composition ideale Cs K Na Ca 2 T1 4+ O [Si 7 O 18 (OH)], triclinique, PI, a 10.4191(4), b 12.2408(5), c 7.0569(3) A, a 90.857(1), β 99.193(1). γ 91.895(1)°, V 887.8(1) A 3 , Z= 2. D calc 3.125 g/cm 3 , provenant du complexe de Dara-i-Pioz, dans les montagnes Tien-Shan. au Tajikistan, jusqu'a un residu R 1 de 4.5% en utilisant 4872 reflexions uniques (F o > 4σF) prelevees avec un diffractometre a monocristal Bruker P4 muni d'un detecteur CCD 4K et rayonnement MoKα. Les analyses effectuees avec une microsonde electronique ont donne SiO 2 51.08 TiO 2 8.94, FeO 0.50, MnO 2.59, CaO 10.98, K 2 O 6.13, Na 2 O 3.76, Nb 2 O 5 0.64, Cs 2 O 15.28, (H 2 O) calc 1.09, pour un total de 100.99% (poids), et la proportion de (H 2 O) a ete etablie par analyse de la structure. La senkevichite est isostructurale avec la tinaksite et la tokkoite. La structure contient sept sites Si a coordinence tetraedrique, avec une distance moyenne de 1.623 A. Six de ces sites sont coordonnes par des atomes d'oxygene, et le site Si(7) est coordonne par trois atomes d'oxygene et un groupe (OH). Il s'agit donc d'un groupe silicate acide. Il y a trois sites M a coordinence [6]. Le site M(1) contient surtout T1 4+ (et un peu de Nb), avec = 1.985 A. Le site M(2) contient uniquement Ca, avec = 2.382 A, et le site M(3) contient Ca (et des quantites mineures de Fe 2+ et Mn 2+ ). avec = 2.317 A. Il y a un site Na a coordinence [7], avec = 2.504 A. Il y a deux sites A, le site A(1) a coordinence [12], contenant surtout le cesium (et un peu de K), avec = 3.318 A. et le site A(2), a coordinence [10], contenant uniquement le K, avec = 2.987A. La senkevichite est l'analoque a Cs de la tinaksite, K 2 Na Ca 2 T1 4+ O [S1 7 O 18 (OH)], et l'oxyanalogue a Cs-Na-Ti 4+ de la tokkoite, K 2 Ca 4 F |Si 7 O 18 (OH)]." @default.
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- W2009710905 date "2006-12-01" @default.
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- W2009710905 title "THE CRYSTAL CHEMISTRY OF SENKEVICHITE, Cs K Na Ca2 Ti O [Si7O18(OH)], FROM THE DARA-I-PIOZ ALKALINE MASSIF, NORTHERN TAJIKISTAN" @default.
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