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 = 72 h
      _database_code_amcsd 0008940

      CELL PARAMETERS:    8.1384   8.1384   8.1384   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    539.035
      Density (g/cm3):      4.004
      MAX. ABS. INTENSITY / VOLUME**2:      33.15096002    
      RIR:      2.696
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.89          1.52        4.6987    1   1   1         8
                31.08         55.25        2.8774    2   2   0        12
                36.62        100.00        2.4538    3   1   1        24
                44.53         19.76        2.0346    4   0   0         6
                48.77          3.10        1.8671    3   3   1        24
                55.30         15.80        1.6612    4   2   2        24
                58.97         38.12        1.5662    5   1   1        24
                58.97          3.70        1.5662    3   3   3         8
                64.80         53.21        1.4387    4   4   0        12
                73.61          5.10        1.2868    6   2   0        24
                76.80          9.67        1.2411    5   3   3        24
                82.03          2.16        1.1747    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.