Crystal chemistry of elpidite from Khan Bogdo (Mongolia) and its K- and Rb-exchanged forms |
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| Authors: | A A Grigor’eva N V Zubkova I V Pekov U Kolitsch D Yu Pushcharovsky M F Vigasina G Giester T Dordevi? E Tillmanns N V Chukanov |
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| Institution: | 1.Faculty of Geology,Moscow State University,Moscow,Russia;2.Department of Mineralogy and Petrography,Museum of Natural History of Vienna,Vienna,Austria;3.Institute of Mineralogy and Crystallography,University of Vienna,Vienna,Austria;4.Institute of Problems of Chemical Physics,Russian Academy of Sciences,Chernogolovka, Moscow oblast,Russia |
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| Abstract: | Elpidite Na2ZrSi6O15 · 3H2O space group Pbcm, a = 7.1312(12), b = 14.6853(12), and c = 14.6349(15) Å] from Khan Bogdo (Mongolia) and its K- and Rb-exchanged forms K1.78Na0.16H0.06ZrSi6O15 · 0.85H2O Cmce, a = 14.054(3), b = 14.308(3), and c = 14.553(3) Å] and Na1.58Rb0.2H0.22ZrSi6O15 · 2.69H2O Pbcm, a = 7.1280(10), b = 14.644(3), and c = 14.642(3) Å] that were obtained by cation exchange at 90°C, as well as K1.84Na0.11H0.05ZrSi6O15 · 0.91H2O Cmce, a = 14.037(3), b = 14.226(3), and c = 14.552(3) Å] and Rb1.78Na0.06H0.16ZrSi6O15 · 0.90H2O Cmce, a = 14.2999(12), b = 14.4408(15), and c = 14.7690(12) Å], obtained at 150°C are studied by single-crystal X-ray diffraction and IR spectroscopy. The base of the structures is a heteropolyhedral Zr-Si-O framework whose cavities accommodate Na (K, Rb) cations and H2O molecules. |
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