Hercynite
      Hill R J
      American Mineralogist 69 (1984) 937-942
      X-ray powder diffraction profile refinement of synthetic hercynite
      inversion parameter = .163
      _database_code_amcsd 0000958

      CELL PARAMETERS:    8.1558   8.1558   8.1558   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    542.498
      Density (g/cm3):      4.255
      MAX. ABS. INTENSITY / VOLUME**2:      43.69738209    
      RIR:      3.344
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.85          1.07        4.7087    1   1   1         8
                31.01         68.07        2.8835    2   2   0        12
                36.54        100.00        2.4591    3   1   1        24
                44.43          8.73        2.0389    4   0   0         6
                48.66          6.11        1.8711    3   3   1        24
                55.17         20.09        1.6648    4   2   2        24
                58.83          4.18        1.5696    3   3   3         8
                58.83         34.82        1.5696    5   1   1        24
                64.65         45.21        1.4418    4   4   0        12
                73.43          6.68        1.2895    6   2   0        24
                76.61          9.41        1.2437    5   3   3        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.