Crystal structures of potassium-exchanged forms of catapleiite and hilairite |
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| Authors: | N. V. Zubkova I. V. Pekov A. G. Turchkova D. Yu. Pushcharovskiĭ S. Merlino M. Pasero N. V. Chukanov |
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| Affiliation: | (1) Faculty of Geology, Moscow State University, Leninskie gory, Moscow, 119992, Russia;(2) Department of Earth Sciences, University of Pisa, Pisa, 56126, Italy;(3) Institute of Problems of Chemical Physics, Russian Academy of Sciences, pr. Akademika Semenova 1, Chernogolovka Moscow oblast, 142432, Russia |
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| 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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