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 = 3.6 GPa
      _database_code_amcsd 0004733

      CELL PARAMETERS:    4.1810   4.1810   4.1810   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     73.087
      Density (g/cm3):      3.662
      MAX. ABS. INTENSITY / VOLUME**2:      34.28719485    
      RIR:      3.048
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                37.25         11.14        2.4139    1   1   1         8
                43.28        100.00        2.0905    2   0   0         6
                62.87         50.15        1.4782    2   2   0        12
                75.40          6.34        1.2606    3   1   1        24
                79.39         13.56        1.2070    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.