Abstract
The crystal structure of the chabazite K with the formula (K1.33Na1.02Ca0.84)[Al4Si8O24] · 12.17H2O from late hydrothermalites in the Khibiny alkaline massif (Kola Peninsula) is established by X-ray diffraction analysis (CAD4 four-circle diffractometer, λMoK α radiation, graphite monochromator, T=193 K, 2θmax = 70°, R 1 = 0.047 for 4745 reflections) on the basis of experimental data (6265 reflections) obtained from a twin (twinning parameter 0.535(1)): a = 13.831(3) Å, c = 15.023(5) Å, sp. gr. \(R\bar 3m\), Z = 3, ρcalcd = 2.016 g/cm3. It is shown that cations occupy five independent positions in large cavities of the tetrahedral Al,Si,O anionic framework in potassium-rich chabazite. A comparative crystallochemical analysis of chabazites of different composition and origin is performed.
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Translated from Kristallografiya, Vol. 50, No. 4, 2005, pp. 595–604.
Original Russian Text Copyright © 2005 by Yakubovich, Massa, Gavrilenko, Pekov.
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Yakubovich, O.V., Massa, W., Gavrilenko, P.G. et al. Crystal structure of chabazite K. Crystallogr. Rep. 50, 544–553 (2005). https://doi.org/10.1134/1.1996728
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DOI: https://doi.org/10.1134/1.1996728