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 = 308 h
      _database_code_amcsd 0008946

      CELL PARAMETERS:    8.1291   8.1291   8.1291   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    537.189
      Density (g/cm3):      3.825
      MAX. ABS. INTENSITY / VOLUME**2:      27.26372558    
      RIR:      2.321
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.91          4.89        4.6933    1   1   1         8
                31.12         49.40        2.8741    2   2   0        12
                36.66        100.00        2.4510    3   1   1        24
                44.59         27.44        2.0323    4   0   0         6
                48.83          1.92        1.8649    3   3   1        24
                55.37         13.97        1.6593    4   2   2        24
                59.05         38.38        1.5644    5   1   1        24
                59.05          3.59        1.5644    3   3   3         8
                64.89         57.17        1.4370    4   4   0        12
                73.71          4.47        1.2853    6   2   0        24
                76.91          9.52        1.2397    5   3   3        24
                82.15          3.03        1.1733    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.