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, disordered model
      _database_code_amcsd 0014040

      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:      7.185505714    
      RIR:      0.838
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                19.38         52.98        4.5813    1   1   1         8
                22.41         49.23        3.9675    2   0   0         6
                31.90        100.00        2.8054    2   2   0        12
                37.59          1.46        2.3925    3   1   1        24
                39.33         37.41        2.2906    2   2   2         8
                45.74         82.54        1.9837    4   0   0         6
                50.11          3.10        1.8204    3   3   1        24
                51.51         11.78        1.7743    4   2   0        24
                56.84         43.65        1.6197    4   2   2        24
                60.64          7.01        1.5271    5   1   1        24
                66.68         17.74        1.4027    4   4   0        12
                70.17          3.75        1.3413    5   3   1        48
                71.31          2.73        1.3225    4   4   2        24
                75.83          8.74        1.2546    6   2   0        24
                80.25          1.22        1.1962    6   2   2        24
                84.61          2.65        1.1453    4   4   4         8
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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.