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 = 565 deg C, P = 29.61 GPa
      rocksalt structure
      _database_code_amcsd 0007646

      CELL PARAMETERS:    4.0738   4.0738   4.0738   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     67.608
      Density (g/cm3):      5.198
      MAX. ABS. INTENSITY / VOLUME**2:      63.88585414    
      RIR:      4.002
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                38.27         38.07        2.3520    1   1   1         8
                44.48        100.00        2.0369    2   0   0         6
                64.72         50.07        1.4403    2   2   0        12
                77.75         13.92        1.2283    3   1   1        24
                81.92         13.90        1.1760    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.