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 = 543 deg C, P = 30.09 GPa
      rocksalt structure
      _database_code_amcsd 0007645

      CELL PARAMETERS:    4.0702   4.0702   4.0702   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     67.429
      Density (g/cm3):      5.212
      MAX. ABS. INTENSITY / VOLUME**2:      64.02095118    
      RIR:      3.999
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                38.30         38.10        2.3499    1   1   1         8
                44.52        100.00        2.0351    2   0   0         6
                64.79         50.04        1.4390    2   2   0        12
                77.83         13.92        1.2272    3   1   1        24
                82.01         13.89        1.1750    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.