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Twin orthorhombic structure of Haüyne from Sakrofano (Italy)

  • Structure of Inorganic Compounds
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Abstract

The structure of haüyne from Sakrofano (Italy) is solved using the superstructure reflections, which double the unit cell parameters in three directions. The cubic symmetry of the diffraction pattern of haüyne results from the twinning of the equidimensional orthorhombic components by the [111] threefold axis. The structure is refined in the orthorhombic space group Pba2 with the unit cell parameters a = b = 12.872(7) Å and c = 9.102(3) Å in the anisotropic approximation to R = 0.043 for 1737 reflections. Compared to high-potassium haüyne from Arissia (Italy), the mineral studied contains potassium in smaller amounts and the distribution of K, Na, and Ca atoms over four body diagonals of the cell is ordered, which apparently causes the lowering of symmetry from cubic to orthorhombic.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia

    N. B. Bolotina & R. K. Rastsvetaeva

  2. Vinogradov Institute of Geochemistry and Analytical Chemistry, Siberian Division, Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia

    A. N. Sapozhnikov

  3. Irkutsk State University of Transport Communications, Irkutsk, Russia

    A. A. Kashaev

Authors
  1. N. B. Bolotina
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  2. R. K. Rastsvetaeva
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  3. A. N. Sapozhnikov
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  4. A. A. Kashaev
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Dedicated to the 60th Anniversary of the Shubnikov Institute of Crystallography of the Russian Academy of Sciences

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Translated from Kristallografiya, Vol. 48, No. 6, 2003, pp. 981–985.

Original Russian Text Copyright © 2003 by Bolotina, Rastsvetaeva, Sapozhnikov, Kashaev.

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Bolotina, N.B., Rastsvetaeva, R.K., Sapozhnikov, A.N. et al. Twin orthorhombic structure of Haüyne from Sakrofano (Italy). Crystallogr. Rep. 48, 914–918 (2003). https://doi.org/10.1134/1.1627431

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  • DOI: https://doi.org/10.1134/1.1627431

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