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- W2282021846 abstract "The crystal structures of six birefringent uvarovite-grossular garnets from three localities (Saranov. Veselovsk, and Saranka. Ural Mountains. Russia) were investigated using single-crystal X-ray CCD diffraction data. The intensity and lattice parameter data attest to the violation of the cubic garnet space group Ia3̅d and the symmetry reduction to subgroups with triclinic (I1̅), monoclinic (I2/a), or at most orthorhombic symmetry (Fddd). Careful structure refinements starting in space group /I reveal that partial long-range Cr3+/Al ordering on the octahedral sites is the most prominent non- cubic feature. For each crystal, a nearly perfect linear correlation of the individual octahedral size with its Cr occupancy is observed. Considering the dependence on the bulk Cr mole fraction, the individual octahedral size in non-cubic uvarovite-grossular solid solutions is represented by <Cr/Al- 0> (Å) = 1.9247 + 0.0147 XCr(bulk) + 0.0534 Xcr(individual). These uvarovites also structurally incorporate traces of hydrous component (<1 wt% H2O) as O4H4 “hydrogarnet” substitution in a non-cubic way. thus leading to further subtle deviations from cubic symmetry. Within the range of these low water contents, the refined Si-O bond length, averaged over crystallographically different tetrahedra. correlates with the total integral OH absorption coefficient αi through the equation ≪ Si-0≫ (Å) = 1.6455 + 1.0074·10-7 αi(cm-2). Although the Si and Ca atoms occupy general positions in I1̅. they deviate little from their respective special positions in la3̅d." @default.
- W2282021846 created "2016-06-24" @default.
- W2282021846 creator A5010088659 @default.
- W2282021846 creator A5039180106 @default.
- W2282021846 date "2001-10-01" @default.
- W2282021846 modified "2023-09-23" @default.
- W2282021846 title "The crystal chemistry of birefringent natural uvarovites: Part II. Single-crystal X-ray structures" @default.
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- W2282021846 doi "https://doi.org/10.2138/am-2001-1011" @default.
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