Periclase
      Wyckoff R
      Zeitschrift fur Kristallographie 62 (1925) 529-539
      Die Kristallstruktur von Silberphosphat und Silberarsenat, Ag3 X O4
      _cod_database_code 1011117
      _database_code_amcsd 0018012

      CELL PARAMETERS:    4.2110   4.2110   4.2110   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     74.672
      Density (g/cm3):      3.585
      MAX. ABS. INTENSITY / VOLUME**2:      33.69969464    
      RIR:      3.061
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                36.97         11.01        2.4312    1   1   1         8
                42.96        100.00        2.1055    2   0   0         6
                62.37         50.44        1.4888    2   2   0        12
                74.77          6.34        1.2697    3   1   1        24
                78.72         13.64        1.2156    2   2   2         8
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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.