Cryolite
      Zhou Q, Kennedy B J
      Journal of Solid State Chemistry 177 (2004) 654-659
      High-temperature powder synchrotron diffraction studies of synthetic cryolite
      Na3AlF6
      Locality: synthetic
      Sample: T = 600 C, ordered model
      _database_code_amcsd 0014039

      CELL PARAMETERS:    7.9350   7.9350   7.9350   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    499.621
      Density (g/cm3):      2.791
      MAX. ABS. INTENSITY / VOLUME**2:      9.352848147    
      RIR:      1.091
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                19.38         45.49        4.5813    1   1   1         8
                22.41         59.48        3.9675    2   0   0         6
                31.90        100.00        2.8054    2   2   0        12
                39.33         32.15        2.2906    2   2   2         8
                45.74         76.89        1.9837    4   0   0         6
                50.11          1.07        1.8204    3   3   1        24
                51.51          7.26        1.7743    4   2   0        24
                56.84         24.19        1.6197    4   2   2        24
                60.64          5.28        1.5271    5   1   1        24
                66.68         18.85        1.4027    4   4   0        12
                70.17          2.67        1.3413    5   3   1        48
                71.31          1.03        1.3225    6   0   0         6
                71.31          1.73        1.3225    4   4   2        24
                75.83         10.07        1.2546    6   2   0        24
                84.61          3.09        1.1453    4   4   4         8
                87.87          1.44        1.1111    5   5   1        24
                88.95          1.49        1.1004    6   4   0        24
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       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.