Rb2O
      Wyckoff R W G
      Crystal Structures 1 (1963) 239-444
      Second edition. Interscience Publishers, New York, New York
      Anti-fluorite structure
      _database_code_amcsd 0011746

      CELL PARAMETERS:    6.7400   6.7400   6.7400   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    306.182
      Density (g/cm3):      4.055
      MAX. ABS. INTENSITY / VOLUME**2:      118.6239282    
      RIR:      9.526
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                22.85          2.49        3.8913    1   1   1         8
                26.45         92.55        3.3700    2   0   0         6
                37.75        100.00        2.3829    2   2   0        12
                46.68         23.02        1.9457    2   2   2         8
                54.45         14.35        1.6850    4   0   0         6
                61.53         26.38        1.5071    4   2   0        24
                68.16         24.97        1.3758    4   2   2        24
                80.64          6.89        1.1915    4   4   0        12
                86.67          2.07        1.1233    6   0   0         6
                86.67          8.27        1.1233    4   4   2        24
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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.