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 = 242 h
      _database_code_amcsd 0008944

      CELL PARAMETERS:    8.1347   8.1347   8.1347   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    538.300
      Density (g/cm3):      3.919
      MAX. ABS. INTENSITY / VOLUME**2:      30.19268482    
      RIR:      2.508
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.90          3.20        4.6966    1   1   1         8
                31.10         52.10        2.8761    2   2   0        12
                36.64        100.00        2.4527    3   1   1        24
                44.55         23.49        2.0337    4   0   0         6
                48.80          2.45        1.8662    3   3   1        24
                55.33         14.76        1.6605    4   2   2        24
                59.00          3.61        1.5655    3   3   3         8
                59.00         38.35        1.5655    5   1   1        24
                64.84         55.01        1.4380    4   4   0        12
                73.65          4.72        1.2862    6   2   0        24
                76.84          9.58        1.2405    5   3   3        24
                82.08          2.58        1.1741    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.