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 = 2055 K
      _database_code_amcsd 0008051

      CELL PARAMETERS:    4.3272   4.3272   4.3272   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     81.025
      Density (g/cm3):      3.304
      MAX. ABS. INTENSITY / VOLUME**2:      31.52276554    
      RIR:      3.107
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                35.95         10.53        2.4983    1   1   1         8
                41.75        100.00        2.1636    2   0   0         6
                60.52         51.54        1.5299    2   2   0        12
                72.44          6.32        1.3047    3   1   1        24
                76.22         13.97        1.2492    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.