Crystal structures of potassium-exchanged forms of catapleiite and hilairite
- Moscow State University, Faculty of Geology (Russian Federation)
- University of Pisa, Department of Earth Sciences (Italy)
- Russian Academy of Sciences, Institute of Problems of Chemical Physics (Russian Federation)
The crystal structures of potassium-exchanged forms of catapleiite and hilairite of the compositions (K{sub 0.49}Ca{sub 0.42}Na{sub 0.26})ZrSi{sub 3}O{sub 9} . 2[(H{sub 2}O){sub 0.8}(H{sub 3}O){sub 0.2}] and K{sub 0.51}ZrSi{sub 3}O{sub 9} . 3[(H{sub 2}O){sub 0.5}K{sub 0.27}(H{sub 3}O){sub 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 H{sub 2}O position.
- OSTI ID:
- 21091393
- Journal Information:
- Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 1 Vol. 52; ISSN 1063-7745; ISSN CYSTE3
- Country of Publication:
- United States
- Language:
- English
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