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 = 30.6 GPa using ruby-scale
      Note: P = 31.5 GPa using MgO-scale
      _database_code_amcsd 0004713

      CELL PARAMETERS:    4.0110   4.0110   4.0110   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     64.529
      Density (g/cm3):      4.148
      MAX. ABS. INTENSITY / VOLUME**2:      37.82370434    
      RIR:      2.969
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                38.89         11.96        2.3158    1   1   1         8
                45.21        100.00        2.0055    2   0   0         6
                65.86         48.56        1.4181    2   2   0        12
                79.21          6.39        1.2094    3   1   1        24
                83.49         13.21        1.1579    2   2   2         8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.