Abstract
The crystallographic analysis of the tourmaline structure type with the general formula XY3Z6(T6O18)(BO3)3V3W (R3m, Z = 3, a ≈ 16 Å, c ≈ 7.2 Å) shows that tetrahedrally coordinated T (Si, Al, …) cations, octahedrally coordinated Z (Al, Fe, Mg), and Y (Fe, Mg, Mn, …) form a joint cation framework with a sublattice whose geometry is close to F cub (a к ≈ 4.40 Å, αк ≈ 93°) with 40% vacant positions in it. The anion ordering is less regular.
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Original Russian Text © 2017 S. V. Borisov, N. V. Pervukhina, S. A. Magarill.
Translated from Zhurnal Strukturnoi Khimii, Vol. 58, No. 4, pp. 839–842, July–August, 2017.
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Borisov, S.V., Pervukhina, N.V. & Magarill, S.A. Cubic cation framework in trigonal structures of tourmalins: The core of structural type stability. J Struct Chem 58, 809–812 (2017). https://doi.org/10.1134/S0022476617040242
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DOI: https://doi.org/10.1134/S0022476617040242