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Topolology-symmetry law of structure of natural titanosilicate micas and related heterophyllosilicates based on the extended OD theory: Structure prediction

Topolology-symmetry law of structure of natural titanosilicate micas and related... Abstract A topology-symmetry analysis of the structures in the family of titanosilicate micas and related heterophyllosilicates based on the extended OD theory reveals their kinship with the family of rhodezite, delhayelite, and other minerals that had been analyzed earlier by distinguishing sheets common for all the structures. Like in the family studied earlier, the structural variety of a more complex titanosilicate family is determined by different local symmetries of sheets. Sheets consist of central O layers of edge-sharing octahedra and H layers formed by tetrahedra connected into diortho groups and Ti(Nb,Fe) semioctahedra (octahedra). Three patterns of connection of O and H layers correspond to sheet symmetry P2/m, P21/m, and \(P\bar 1\). Various symmetry modes of sheet connection in the structures are analyzed. Hypothetical structures, including structures with a higher degree of disorder, which can be found in nature or obtained by crystal synthesis, are deduced. Factors responsible for structural variety, including the existence of two main sheet varieties (with P2/m and P21/m symmetry) are considered a consequence of the difference in the chemism of the mineral formation medium. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Crystallography Reports Springer Journals

Topolology-symmetry law of structure of natural titanosilicate micas and related heterophyllosilicates based on the extended OD theory: Structure prediction

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References (31)

Publisher
Springer Journals
Copyright
2015 Pleiades Publishing, Inc.
ISSN
1063-7745
eISSN
1562-689X
DOI
10.1134/s1063774515010058
Publisher site
See Article on Publisher Site

Abstract

Abstract A topology-symmetry analysis of the structures in the family of titanosilicate micas and related heterophyllosilicates based on the extended OD theory reveals their kinship with the family of rhodezite, delhayelite, and other minerals that had been analyzed earlier by distinguishing sheets common for all the structures. Like in the family studied earlier, the structural variety of a more complex titanosilicate family is determined by different local symmetries of sheets. Sheets consist of central O layers of edge-sharing octahedra and H layers formed by tetrahedra connected into diortho groups and Ti(Nb,Fe) semioctahedra (octahedra). Three patterns of connection of O and H layers correspond to sheet symmetry P2/m, P21/m, and \(P\bar 1\). Various symmetry modes of sheet connection in the structures are analyzed. Hypothetical structures, including structures with a higher degree of disorder, which can be found in nature or obtained by crystal synthesis, are deduced. Factors responsible for structural variety, including the existence of two main sheet varieties (with P2/m and P21/m symmetry) are considered a consequence of the difference in the chemism of the mineral formation medium.

Journal

Crystallography Reports – Springer Journals

Published: Jan 1, 2015

Keywords: Crystallography and Scattering Methods

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