Gupeiite
      Farquhar M C M, Lipson H, Weill A R
      Journal of the Iron and Steel Institute 152 (1945) 457-472
      An X-ray study of iron-rich iron-silicon alloys
      Locality: synthetic
      _database_code_amcsd 0019760

      CELL PARAMETERS:    5.6550   5.6550   5.6550   90.000   90.000   90.000
      SPACE GROUP: Fm3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    180.841
      Density (g/cm3):      7.184
      MAX. ABS. INTENSITY / VOLUME**2:      240.2756438    
      RIR:     10.890
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                27.32          6.26        3.2649    1   1   1         8
                31.64          3.20        2.8275    2   0   0         6
                45.36        100.00        1.9993    2   2   0        12
                53.76          2.32        1.7050    3   1   1        24
                66.09         13.57        1.4138    4   0   0         6
                83.80         24.37        1.1543    4   2   2        24
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.