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 = 356 h
      _database_code_amcsd 0008947

      CELL PARAMETERS:    8.1198   8.1198   8.1198   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    535.348
      Density (g/cm3):      3.659
      MAX. ABS. INTENSITY / VOLUME**2:      22.20262443    
      RIR:      1.976
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.93         13.98        4.6880    1   1   1         8
                31.15         41.78        2.8708    2   2   0        12
                36.71        100.00        2.4482    3   1   1        24
                38.40          1.01        2.3440    2   2   2         8
                44.64         39.66        2.0299    4   0   0         6
                55.44         11.60        1.6574    4   2   2        24
                59.12          3.37        1.5627    3   3   3         8
                59.12         39.90        1.5627    5   1   1        24
                64.97         63.05        1.4354    4   4   0        12
                68.35          1.32        1.3725    5   3   1        48
                73.81          3.65        1.2839    6   2   0        24
                77.01          9.59        1.2383    5   3   3        24
                82.26          4.48        1.1720    4   4   4         8
                85.38          1.58        1.1370    5   5   1        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.