Periclase
      Fei Y, Mao H K, Shu J F, Hu J
      Physics and Chemistry of Minerals 18 (1992) 416-422
      P-V-T equation of state of magnesiowustite (Mg0.6Fe0.4)O
      Sample: T = 408 deg C, P = 25.76 GPa
      rocksalt structure
      _database_code_amcsd 0007680

      CELL PARAMETERS:    4.0893   4.0893   4.0893   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     68.383
      Density (g/cm3):      5.140
      MAX. ABS. INTENSITY / VOLUME**2:      63.30758397    
      RIR:      4.011
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                38.12         37.93        2.3610    1   1   1         8
                44.30        100.00        2.0447    2   0   0         6
                64.45         50.21        1.4458    2   2   0        12
                77.40         13.92        1.2330    3   1   1        24
                81.54         13.93        1.1805    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.