Na2O
      Wyckoff R W G
      Crystal Structures 1 (1963) 239-444
      Second edition. Interscience Publishers, New York, New York
      Anti-fluorite structure
      _database_code_amcsd 0011742

      CELL PARAMETERS:    5.5500   5.5500   5.5500   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    170.954
      Density (g/cm3):      2.408
      MAX. ABS. INTENSITY / VOLUME**2:      22.51046947    
      RIR:      3.044
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                27.84         23.86        3.2043    1   1   1         8
                32.26         38.15        2.7750    2   0   0         6
                46.27        100.00        1.9622    2   2   0        12
                54.86          5.82        1.6734    3   1   1        24
                57.52          7.94        1.6021    2   2   2         8
                67.51         10.77        1.3875    4   0   0         6
                74.53          1.48        1.2733    3   3   1        24
                76.81          7.26        1.2410    4   2   0        24
                85.76         15.93        1.1329    4   2   2        24
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.