Abstract
As a result of experimental studies on the interaction between a charoite substrate and host lamprophyres of microcline-arfvedsonitic composition, a new (K,Na)3Ca8Si6[Si4O12]3 compound has been obtained with a new type of radical Si2[Si4O12] found in its crystalline structure а = 15.2613 (3) Ǻ, I2/13, Z = 4. The chain-shaped Ca-octahedra connected through common faces encircle a radical and close in a K-octagon. In contrast to charoite with banded-tube radicals, an isometrically-island silicon radical is identified.
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ACKNOWLEDGMENTS
The authors are grateful to A.V. Vashchenko and A.N. Sapozhnikov for their assistance in the work on the diffractometer and in interpreting the figures, to L.Z. Reznitskii for his participation in the calculation of the specific weight of the new compound, and to M.V. Marchuk for his help in conducting the experiments.
This work was supported by the Russian Foundation for Basic Research, grant nos. 10-05-00344, 16-05-00392, and Baikal 14-45-04108 and by the Government of Irkutsk oblast.
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Kashaev, A.A., Ivanova, L.A., Medvedev, V.J. et al. A New Compound of the (K,Na)3Ca8Si6[Si4O12]3 Charoite Substrate. Dokl. Earth Sc. 484, 160–162 (2019). https://doi.org/10.1134/S1028334X1902003X
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DOI: https://doi.org/10.1134/S1028334X1902003X