Periclase
      Boiocchi M, Caucia F, Merli M, Prella D, Ungaretti L
      European Journal of Mineralogy 13 (2001) 871-881
      Crystal-chemical reasons for the immiscibility of periclase and wustite
      under lithospheric P,T conditions
      Sample: Per.4041
      _database_code_amcsd 0006902

      CELL PARAMETERS:    4.2154   4.2154   4.2154   90.000   90.000   90.000
      SPACE GROUP: Fm-3m     
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     74.906
      Density (g/cm3):      3.646
      MAX. ABS. INTENSITY / VOLUME**2:      37.13604307    
      RIR:      3.316
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                36.93         12.01        2.4338    1   1   1         8
                42.91        100.00        2.1077    2   0   0         6
                62.30         53.50        1.4904    2   2   0        12
                74.68          7.05        1.2710    3   1   1        24
                78.62         15.33        1.2169    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.