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Univ. Chicago, Dep. Geophys. Sci., Chicago, IL, United States
Monoclinic, space group P2/n, with a = 9.916(1), b = 11.384(1), c = 9.631(1) angstrom, beta = 109.30(1) degrees . Nine octahedral cations and five tetrahedral cations incorporated in a cubic close-packed array of sixteen independent oxygen atoms.--Modified journal abstract.
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