Periclase
      Dubrovinsky L S, Saxena S K
      Physics and Chemistry of Minerals 24 (1997) 547-550
      Thermal expansion of periclase (MgO) and tungsten (W)
      to melting temperatures
      Sample: T = 455 K
      _database_code_amcsd 0008039

      CELL PARAMETERS:    4.2181   4.2181   4.2181   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     75.050
      Density (g/cm3):      3.567
      MAX. ABS. INTENSITY / VOLUME**2:      33.56220639    
      RIR:      3.064
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                36.91         10.98        2.4353    1   1   1         8
                42.88        100.00        2.1091    2   0   0         6
                62.25         50.51        1.4913    2   2   0        12
                74.62          6.34        1.2718    3   1   1        24
                78.56         13.66        1.2177    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.