SiMg2
      Wyckoff R W G
      Crystal Structures 1 (1963) 239-444
      Second edition. Interscience Publishers, New York, New York
      Fluorite structure
      _database_code_amcsd 0011717

      CELL PARAMETERS:    6.3900   6.3900   6.3900   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    260.917
      Density (g/cm3):      1.952
      MAX. ABS. INTENSITY / VOLUME**2:      26.24599059    
      RIR:      4.378
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                24.12         37.47        3.6893    1   1   1         8
                27.93         10.61        3.1950    2   0   0         6
                39.90        100.00        2.2592    2   2   0        12
                47.17         15.26        1.9267    3   1   1        24
                49.41          2.70        1.8446    2   2   2         8
                57.71         15.19        1.5975    4   0   0         6
                63.45          5.92        1.4660    3   3   1        24
                65.30          2.71        1.4288    4   2   0        24
                72.46         27.62        1.3044    4   2   2        24
                77.64          3.17        1.2298    5   1   1        24
                77.64          1.06        1.2298    3   3   3         8
                86.07          7.98        1.1296    4   4   0        12
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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.