Crystal structures of low-symmetry cancrinite and cancrisilite varieties |
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| Authors: | R K Rastsvetaeva I V Pekov N V Chukanov K A Rozenberg L V Olysych |
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| Institution: | (1) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskiĭ pr. 59, Moscow, 119333, Russia;(2) Lomonosov Moscow State University, Leninskie gory, Moscow, 119992, Russia;(3) Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia |
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| Abstract: | The high-sodium variety of cancrinite Si6.3Al5.7O24]Na2(H2O)2]Na5.7(CO3)0.9(SO4)0.1(H2O)0.6] (Kovdor Massif, Kola Peninsula, Russia) and the calcium-containing variety of cancrisilite Si6.6Al5.4O24](Na1.2Ca0.4)(H2O)1.6]Na6(CO3)1.3(H2O)1.2] (Khibiny Massif, Kola Peninsula, Russia) are studied. The trigonal unit cell parameters of the crystal structures under investigation are as follows: a = 12.727(4) Å, c = 5.186(2) Å, and space group P3 for the former mineral and a = 12.607(4) Å, c = 5.111(1) Å, and space group P3 for the latter mineral. The reduced symmetry of the new varieties as compared to the symmetry of typical cancrinite and typical cancrisilite is associated with the specific features in the arrangement of the carbonate groups and water molecules in channels. This inference is confirmed by the IR spectroscopic data. |
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