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 = 212 h
      _database_code_amcsd 0008942

      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):      4.011
      MAX. ABS. INTENSITY / VOLUME**2:      33.15350090    
      RIR:      2.691
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.89          1.71        4.6985    1   1   1         8
                31.08         55.20        2.8772    2   2   0        12
                36.62        100.00        2.4537    3   1   1        24
                44.53         19.87        2.0345    4   0   0         6
                48.78          3.07        1.8670    3   3   1        24
                55.30         15.62        1.6612    4   2   2        24
                58.98          3.64        1.5662    3   3   3         8
                58.98         38.21        1.5662    5   1   1        24
                64.81         52.93        1.4386    4   4   0        12
                73.62          4.99        1.2867    6   2   0        24
                76.81          9.61        1.2410    5   3   3        24
                82.04          2.17        1.1746    4   4   4         8
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.