Spinel
      Redfern S A T, Harrison R J, O'Neill H St C, Wood D R R
      American Mineralogist 84 (1999) 299-310
      Thermodynamics and kinetics of cation ordering in MgAl2O4 spinel up to 1600 C
      from in situ neutron diffraction
      Data collected at IPNS, Argonne National Laboratory,
      T = 1468 K on cooling cycle, MgAl2O4
      _database_code_amcsd 0002128

      CELL PARAMETERS:    8.1681   8.1681   8.1681   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    544.958
      Density (g/cm3):      3.467
      MAX. ABS. INTENSITY / VOLUME**2:      17.11741734    
      RIR:      1.607
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.82         28.30        4.7159    1   1   1         8
                30.97         32.53        2.8879    2   2   0        12
                36.48        100.00        2.4628    3   1   1        24
                38.17          1.29        2.3579    2   2   2         8
                44.36         54.55        2.0420    4   0   0         6
                55.08          8.52        1.6673    4   2   2        24
                58.74          3.23        1.5720    3   3   3         8
                58.74         35.62        1.5720    5   1   1        24
                64.54         61.76        1.4439    4   4   0        12
                67.89          2.39        1.3807    5   3   1        48
                73.30          2.48        1.2915    6   2   0        24
                76.47          7.84        1.2456    5   3   3        24
                81.67          5.23        1.1790    4   4   4         8
                84.76          1.72        1.1438    5   5   1        24
                89.87          3.39        1.0915    6   4   2        48
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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.