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 = 500 C, t = 116 h
      _database_code_amcsd 0008941

      CELL PARAMETERS:    8.1380   8.1380   8.1380   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    538.956
      Density (g/cm3):      4.024
      MAX. ABS. INTENSITY / VOLUME**2:      33.49400346    
      RIR:      2.710
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.89          2.38        4.6985    1   1   1         8
                31.08         53.39        2.8772    2   2   0        12
                36.62        100.00        2.4537    3   1   1        24
                44.53         20.80        2.0345    4   0   0         6
                48.78          2.66        1.8670    3   3   1        24
                55.30         15.18        1.6612    4   2   2        24
                58.98          3.68        1.5662    3   3   3         8
                58.98         38.30        1.5662    5   1   1        24
                64.81         53.38        1.4386    4   4   0        12
                73.62          4.87        1.2867    6   2   0        24
                76.81          9.71        1.2410    5   3   3        24
                82.04          2.32        1.1746    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.