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 = 260 h
      _database_code_amcsd 0008945

      CELL PARAMETERS:    8.1329   8.1329   8.1329   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    537.943
      Density (g/cm3):      3.895
      MAX. ABS. INTENSITY / VOLUME**2:      29.64187855    
      RIR:      2.478
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.90          3.27        4.6955    1   1   1         8
                31.10         51.75        2.8754    2   2   0        12
                36.65        100.00        2.4522    3   1   1        24
                44.56         24.11        2.0332    4   0   0         6
                48.81          2.40        1.8658    3   3   1        24
                55.34         14.78        1.6601    4   2   2        24
                59.02         38.51        1.5652    5   1   1        24
                59.02          3.64        1.5652    3   3   3         8
                64.85         55.88        1.4377    4   4   0        12
                73.67          4.77        1.2859    6   2   0        24
                76.86          9.69        1.2403    5   3   3        24
                82.10          2.68        1.1739    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.