Periclase
      Hazen R M
      American Mineralogist 61 (1976) 266-271
      Effects of temperature and pressure on the cell dimension and X-ray temperature
      factors of periclase
      T = 300 C, P = 1 atm
      _database_code_amcsd 0000504

      CELL PARAMETERS:    4.2250   4.2250   4.2250   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     75.419
      Density (g/cm3):      3.549
      MAX. ABS. INTENSITY / VOLUME**2:      33.48392429    
      RIR:      3.072
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                36.85         10.31        2.4393    1   1   1         8
                42.81        100.00        2.1125    2   0   0         6
                62.14         50.52        1.4938    2   2   0        12
                74.48          5.55        1.2739    3   1   1        24
                78.41         13.64        1.2197    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.