Hercynite
      Lavina B, Princivalle F, Della Giusta A
      Physics and Chemistry of Minerals 32 (2005) 83-88
      Controlled time-temperature oxidation reaction in a synthetic Mg-hercynite
      Spinel structure
      Sample: Annealing temperature and time T = 600 C, t = 236 h
      _database_code_amcsd 0008943

      CELL PARAMETERS:    8.1366   8.1366   8.1366   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    538.677
      Density (g/cm3):      3.958
      MAX. ABS. INTENSITY / VOLUME**2:      31.03433806    
      RIR:      2.553
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.89          3.98        4.6977    1   1   1         8
                31.09         50.58        2.8767    2   2   0        12
                36.63        100.00        2.4533    3   1   1        24
                44.54         23.74        2.0341    4   0   0         6
                48.79          2.09        1.8667    3   3   1        24
                55.31         14.27        1.6609    4   2   2        24
                58.99          3.63        1.5659    3   3   3         8
                58.99         37.88        1.5659    5   1   1        24
                64.82         54.07        1.4384    4   4   0        12
                73.63          4.54        1.2865    6   2   0        24
                76.82          9.46        1.2408    5   3   3        24
                82.06          2.59        1.1744    4   4   4         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.