Villiaumite
      Deshpande V T
      Acta Crystallographica 14 (1961) 794-794
      Thermal expansion of sodium fluoride and sodium bromide
      Note: T = 29.6 C, rocksalt structure
      _database_code_amcsd 0009251

      CELL PARAMETERS:    4.6340   4.6340   4.6340   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     99.510
      Density (g/cm3):      2.802
      MAX. ABS. INTENSITY / VOLUME**2:      28.04107316    
      RIR:      3.258
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                33.49          1.89        2.6754    1   1   1         8
                38.87        100.00        2.3170    2   0   0         6
                56.14         50.68        1.6384    2   2   0        12
                70.38         12.86        1.3377    2   2   2         8
                83.43          4.74        1.1585    4   0   0         6
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.