Abstract
The formula of chlorinated bystrite (rare mineral of cancrinite group) has been refined to Na7.22Ca0.92[Al6Si6O24](S5)0.94Cl1.01. The X-ray diffraction data on the contents of chlorine and sulfur in this mineral are confirmed by the results of chemical analysis. The bystrite cage is found to contain a (S5)2–cluster, which is elongated along the c axis and has a chain configuration. Different ways of aggregation of sulfur atoms lead to cis- and trans-configurations of chains. Columns of cancrinite cages contain–Ca–Cl–Ca–Cl–chains, which were observed previously in the structures of minerals of davyne subgroup, afghanite, and tounkite.
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Original Russian Text © E.V. Kaneva, A.N. Sapozhnikov, L.F. Suvorova, 2017, published in Kristallografiya, 2017, Vol. 62, No. 4, pp. 573–580.
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Kaneva, E.V., Sapozhnikov, A.N. & Suvorova, L.F. Crystal structure of chlorinated mineral of cancrinite group with bystrite-type framework. Crystallogr. Rep. 62, 558–565 (2017). https://doi.org/10.1134/S1063774517040071
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DOI: https://doi.org/10.1134/S1063774517040071