Villiaumite
      Deshpande V T
      Acta Crystallographica 14 (1961) 794-794
      Thermal expansion of sodium fluoride and sodium bromide
      Note: T = 254 C, rocksalt structure
      _database_code_amcsd 0009257

      CELL PARAMETERS:    4.6726   4.6726   4.6726   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    102.018
      Density (g/cm3):      2.733
      MAX. ABS. INTENSITY / VOLUME**2:      27.45826595    
      RIR:      3.271
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                33.21          1.86        2.6977    1   1   1         8
                38.53        100.00        2.3363    2   0   0         6
                55.63         51.11        1.6520    2   2   0        12
                69.71         13.02        1.3489    2   2   2         8
                82.59          4.79        1.1681    4   0   0         6
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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.