Functional substitution of coordination polyhedron in crystal structure of silicates |
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Authors: | Email author" target="_blank">Danian?YeEmail author D?Pushcharovsky Nicheng?Shi Zhesheng?Ma Wei?He Zhe?Li |
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Institution: | 1. Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2. Department of Geology,Moscow State University,Russia 3. China University of Geosciences,Beijing 100083,China |
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Abstract: | On the bases of the study of comparative crystal chemistry of silicates it has been concluded that the octahedra and square
pyramids of Ti-0 and Zr-0 play functional role of tetrahedra of Si-0 in the construction of crystal structures. Therefore,
those silicates may be named titano-and zircono-silicates. Because of the functional similarity of coordination polyhedra,
the structures of cristobalite and feldspar have been compared with those of perovskite and garnet, respectively. As a new
concept, the functional replacement of tetrahedra by octahedra and/or pyramids is defined by the authors of this paper for
favorable comparison of relative crystal structures. |
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Keywords: | coordination polyhedron functional replacement titano-silicates zircono-silicates |
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