MgSe
      Wyckoff R W G
      Crystal Structures 1 (1963) 85-237
      Second edition. Interscience Publishers, New York, New York
      rocksalt structure
      _database_code_amcsd 0011351

      CELL PARAMETERS:    5.4510   5.4510   5.4510   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    161.968
      Density (g/cm3):      4.234
      MAX. ABS. INTENSITY / VOLUME**2:      104.4058530    
      RIR:      8.029
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                28.36         52.43        3.1471    1   1   1         8
                32.86        100.00        2.7255    2   0   0         6
                47.16         68.20        1.9272    2   2   0        12
                55.95         21.43        1.6435    3   1   1        24
                58.67         22.35        1.5736    2   2   2         8
                68.90          9.79        1.3628    4   0   0         6
                76.12          8.40        1.2505    3   3   1        24
                78.47         25.81        1.2189    4   2   0        24
                87.71         18.89        1.1127    4   2   2        24
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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.