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 = 1671 K on cooling cycle, Mg.99Al2O4
      _database_code_amcsd 0002181

      CELL PARAMETERS:    8.1934   8.1934   8.1934   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    550.030
      Density (g/cm3):      3.436
      MAX. ABS. INTENSITY / VOLUME**2:      16.81915400    
      RIR:      1.594
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.76         26.81        4.7304    1   1   1         8
                30.87         32.18        2.8968    2   2   0        12
                36.37        100.00        2.4704    3   1   1        24
                38.05          1.22        2.3652    2   2   2         8
                44.22         53.77        2.0483    4   0   0         6
                54.90          8.35        1.6725    4   2   2        24
                58.54          3.35        1.5768    3   3   3         8
                58.54         33.85        1.5768    5   1   1        24
                64.32         59.53        1.4484    4   4   0        12
                67.65          2.26        1.3849    5   3   1        48
                73.04          2.41        1.2955    6   2   0        24
                76.19          7.49        1.2495    5   3   3        24
                81.37          4.94        1.1826    4   4   4         8
                84.43          1.52        1.1473    5   5   1        24
                89.52          3.07        1.0949    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.