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.
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References
Agrell, S. O. Min Mag. 34, 1–15 (1965).
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).
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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DOI: https://doi.org/10.1038/269231a0
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