Crystal structure of rustumite

Abstract

RUSTUMITE was first described by Agrell1 as Ca4Si2O7(OH)2, space group Cc or C2/c, a = 7.62(5), b=18.55(5), c = 15.51(5)Å, β = 104°20′(10′), with Z = 10. The crystal structure we describe here, in space group C2/c (R = 11.3% for all data) gives, instead, an ideal formula Ca10(Si2O7)2SiO4Cl2(OH)2, with Z = 4. The important features of the completed structure are the presence of chlorine and of orthosilicate groups in addition to Si2O7 groups.

References

  1. 1

    Agrell, S. O. Min Mag. 34, 1–15 (1965).

  2. 2

    Ilyukhin, V. V. Direct and Patterson Methods for Solving Crystal Structures (in Russian, Institute of Applied Physics, Academy of Science (Moldavia), U.S.S.R., Kishinev, 1972).

  3. 3

    Kuz'min, E. A., Ilyukhin, V. V. & Petrunina, A. A. The Method of Vector Sub-Systems (in Russian, Institute of Geochemistry and Mineral Physics, Academy of Science (Ukraine), U.S.S.R., Kiev, 1976).

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HOWIE, R., ILYUKHIN, V. Crystal structure of rustumite. Nature 269, 231 (1977). https://doi.org/10.1038/269231a0

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