Villiaumite
      Deshpande V T
      Acta Crystallographica 14 (1961) 794-794
      Thermal expansion of sodium fluoride and sodium bromide
      Note: T = 176 C, rocksalt structure
      _database_code_amcsd 0009255

      CELL PARAMETERS:    4.6585   4.6585   4.6585   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    101.097
      Density (g/cm3):      2.758
      MAX. ABS. INTENSITY / VOLUME**2:      27.66970777    
      RIR:      3.266
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                33.31          1.87        2.6896    1   1   1         8
                38.66        100.00        2.3293    2   0   0         6
                55.82         50.95        1.6470    2   2   0        12
                69.96         12.96        1.3448    2   2   2         8
                82.90          4.77        1.1646    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.