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 = 596 h
      _database_code_amcsd 0008949

      CELL PARAMETERS:    8.1076   8.1076   8.1076   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    532.938
      Density (g/cm3):      3.447
      MAX. ABS. INTENSITY / VOLUME**2:      17.06040834    
      RIR:      1.611
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.96         23.90        4.6809    1   1   1         8
                31.20         36.35        2.8665    2   2   0        12
                36.77        100.00        2.4445    3   1   1        24
                38.46          2.74        2.3405    2   2   2         8
                44.71         55.09        2.0269    4   0   0         6
                55.53         10.04        1.6550    4   2   2        24
                59.22          3.18        1.5603    3   3   3         8
                59.22         41.21        1.5603    5   1   1        24
                65.08         71.26        1.4332    4   4   0        12
                68.46          2.35        1.3704    5   3   1        48
                73.94          3.16        1.2819    6   2   0        24
                77.15          9.63        1.2364    5   3   3        24
                82.41          6.26        1.1702    4   4   4         8
                85.54          2.21        1.1353    5   5   1        24
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.