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- W2048631124 abstract "The crystal structure of apophyllite (Andersberg — GDR), with a = 8.966(2), c = = 15.767(1) Å, P4/mnc, z = 2, Q = 2.35 gm · cm−3, has been refined (R = 0.035) by least squares with 976 reflections collected with a diffractometer. Apophyllite is a sheet structure with the bringing SiO bond lengths 1.6236 Å, while the non-bridging bond length SiO(3) is 1.5843 Å. The two independent SiOSi angles are 140.09, 140.76 degrees. The mean SiO bond length is 1.6138 Å. As it was not possible to locate unequivocally the H-atoms with the X-ray data, the interpretation of the of water in the structure was based on the charge balance approach of DONNAY and ALLMAN. Assuming that the fluorine ion is bonded to calcium ion (Ca-F = = 2.416 Å) and to H3 atom (F-H3 = 0.9145(1) Å) and water molecule hydrogen bonded to silicate framework. The average bond distances O-H are 0.962(2) Å and angle 105.24(1)°." @default.
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- W2048631124 date "1987-08-01" @default.
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- W2048631124 title "An X-ray diffraction refinement of the crystal structure of natural apophyllite" @default.
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- W2048631124 doi "https://doi.org/10.1002/crat.2170220808" @default.
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