Periclase
      Jacobsen S D, Holl C M, Adams K A, Fischer R A, Martin E S, Bina C R, Lin J F,
      Prakapenka V B, Kubo A, Dera P
      American Mineralogist 93 (2008) 1823-1828
      Compression of single-crystal magnesium oxide to 118 GPa and a ruby pressure
      gauge for helium pressure media
      Note: P = 62.8 GPa using ruby-scale
      Note: P = 65.3 GPa using MgO-scale
      _database_code_amcsd 0004698

      CELL PARAMETERS:    3.8780   3.8780   3.8780   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     58.321
      Density (g/cm3):      4.590
      MAX. ABS. INTENSITY / VOLUME**2:      40.84780192    
      RIR:      2.898
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                40.28         12.71        2.2390    1   1   1         8
                46.85        100.00        1.9390    2   0   0         6
                68.43         47.36        1.3711    2   2   0        12
                82.50          6.44        1.1693    3   1   1        24
                87.04         13.05        1.1195    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.