Crystal structure of a new representative of the cancrinite group with a 12-layer stacking sequence of tetrahedral rings |
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Authors: | K. A. Rozenberg A. N. Sapozhnikov R. K. Rastsvetaeva N. B. Bolotina A. A. Kashaev |
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Affiliation: | (1) Faculty of Geology, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia;(2) Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia;(3) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia;(4) Irkutsk State University of Transport Communications, ul. Chernyshevskogo 15, Irkutsk, 664074, Russia |
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Abstract: | The crystal structure of a 12-layer tounkite-like mineral of the cancrinite group was determined for the first time by single-crystal X-ray diffraction analysis (the unit-cell parameters are a = 12.757 Å, c = 32.211 Å). The structure was refined in the space group P3 to R = 0.035 using 3834 reflections with | F| > 2σ(F). Si and Al atoms occupy tetrahedral framework positions in an ordered fashion. The average distances in the tetrahedra are 〈Si-O〉 = 1.611 Å and 〈Al-O〉 = 1.723 Å. The stacking sequence of the layers is described as CACACBCBCACB, where A, B, and C are six-membered rings arranged around the [2/3 1/3 z], [1/3 2/3 z], and [0 0 z] axes, respectively. In the structure of the mineral, the columns along the [0 0 z] axis are composed of cancrinite cages. The columns along the [2/3 1/3 z] and [1/3 2/3 z] axes contain alternating cancrinite, bystrite, and liottite cages. |
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