Abstract
The crystal structures of potassium-exchanged forms of catapleiite and hilairite of the compositions (K0.49Ca0.42Na0.26)ZrSi3O9 · 2[(H2O)0.8(H3O)0.2] and K0.51ZrSi3O9 · 3[(H2O)0.5K0.27(H3O)0.23], respectively, were studied by X-ray diffraction and IR spectroscopy. Both structures retain the heteropolyhedral frameworks of the parent minerals formed by Zr octahedra and Si tetrahedra. The K cations occupy different positions in these minerals. In K-exchanged catapleiite, K cations are located only in the position occupied by Na in the structure of the parent mineral. In the K-exchanged form of hilairite, K cations are not only involved in the Na position but also partially occupy the H2O position.
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Dedicated to the 50th Anniversary of the Journal and Prof. H. Fuss
Original Russian Text © N.V. Zubkova, I.V. Pekov, A. G. Turchkova, D.Yu. Pushcharovskiĭ, S. Merlino, M. Pasero, N.V. Chukanov, 2007, published in Kristallografiya, 2007, Vol. 52, No. 1, pp. 68–72.
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Zubkova, N.V., Pekov, I.V., Turchkova, A.G. et al. Crystal structures of potassium-exchanged forms of catapleiite and hilairite. Crystallogr. Rep. 52, 65–70 (2007). https://doi.org/10.1134/S1063774507010075
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DOI: https://doi.org/10.1134/S1063774507010075