Abstract
Two samples of mineral mariinskite have been investigated by single-crystal X-ray diffraction, and their formulas were established to be Cr1.43Al0.64Be0.9O4 (sample 1) and Cr1.32Al0.74Be0.9O4 (sample 2). The parameters of their orthorhombic cells are, respectively, a = 4.487(1) Å, b = 5.629(1) Å, and c = 9.732(2) Å and a = 4.478(1) Å, b = 5.620(1) Å, and c = 9.746(2) Å; sp. gr. P212121. The structures of samples 1 and 2 were solved by direct methods and refined in the anisotropic approximation of thermal atomic vibrations to R = 8.9 and 6.06%, respectively. Two components coexist in the mineral crystal structure, which belong to olivine-type structure and are interrelated through reflection in the mirror symmetry plane passing through close-packed layers. The presence of additional octahedral sites (which are statistically occupied by Cr3+ ions in the same way as vacancies in principal sites (occupancy ∼80%)) in the mariinskite structure lowers the mineral symmetry from the centrosymmetric sp. gr. Pcmn, characteristic of olivine-group minerals, to the acentric sp. gr. P212121.
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Original Russian Text © N.A. Yamnova, S.M. Aksenov, L.A. Pautov, M.P. Popov, Yu.V. Erokhin, 2014, published in Kristallografiya, 2014, Vol. 59, No. 1, pp. 35–40.
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Yamnova, N.A., Aksenov, S.M., Pautov, L.A. et al. Specific features of cation distribution in the crystal structure of mariinskite BeCr2O4 (Derivative of olivine-type structure). Crystallogr. Rep. 59, 30–35 (2014). https://doi.org/10.1134/S1063774514010192
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DOI: https://doi.org/10.1134/S1063774514010192