RbBr
      Wyckoff R W G
      Crystal Structures 1 (1963) 85-237
      Second edition. Interscience Publishers, New York, New York
      rocksalt structure
      _database_code_amcsd 0011384

      CELL PARAMETERS:    6.8540   6.8540   6.8540   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    321.983
      Density (g/cm3):      3.411
      MAX. ABS. INTENSITY / VOLUME**2:      124.2863465    
      RIR:     11.864
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                26.00        100.00        3.4270    2   0   0         6
                37.10         73.04        2.4233    2   2   0        12
                45.86         24.87        1.9786    2   2   2         8
                53.48         11.09        1.7135    4   0   0         6
                60.40         28.96        1.5326    4   2   0        24
                66.87         20.19        1.3991    4   2   2        24
                79.03          5.72        1.2116    4   4   0        12
                84.89          2.30        1.1423    6   0   0         6
                84.89          9.20        1.1423    4   4   2        24
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.