Periclase
      Fiquet G, Richet P, Montagnac G
      Physics and Chemistry of Minerals 27 (1999) 103-111
      High-temperature thermal expansion of lime, periclase,
      corundum and spinel
      Sample: IR wire, T = 874 K
      _database_code_amcsd 0008335

      CELL PARAMETERS:    4.2440   4.2440   4.2440   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     76.441
      Density (g/cm3):      3.502
      MAX. ABS. INTENSITY / VOLUME**2:      33.06567569    
      RIR:      3.075
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                36.68         10.87        2.4503    1   1   1         8
                42.61        100.00        2.1220    2   0   0         6
                61.83         50.75        1.5005    2   2   0        12
                74.09          6.33        1.2796    3   1   1        24
                77.99         13.73        1.2251    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.