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 = 452 h
      _database_code_amcsd 0008948

      CELL PARAMETERS:    8.1172   8.1172   8.1172   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    534.834
      Density (g/cm3):      3.614
      MAX. ABS. INTENSITY / VOLUME**2:      21.28329407    
      RIR:      1.918
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.94         12.45        4.6865    1   1   1         8
                31.17         42.58        2.8699    2   2   0        12
                36.72        100.00        2.4474    3   1   1        24
                38.42          1.56        2.3432    2   2   2         8
                44.65         40.02        2.0293    4   0   0         6
                55.46         11.96        1.6569    4   2   2        24
                59.14         39.64        1.5622    5   1   1        24
                59.14          3.40        1.5622    3   3   3         8
                64.99         64.00        1.4349    4   4   0        12
                68.37          1.14        1.3721    5   3   1        48
                73.84          3.81        1.2834    6   2   0        24
                77.04          9.56        1.2379    5   3   3        24
                82.29          4.48        1.1716    4   4   4         8
                85.41          1.47        1.1366    5   5   1        24
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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.