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 = 1492 K on cooling cycle, Mg.99Al2O4
      _database_code_amcsd 0002184

      CELL PARAMETERS:    8.1776   8.1776   8.1776   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    546.862
      Density (g/cm3):      3.455
      MAX. ABS. INTENSITY / VOLUME**2:      17.10450861    
      RIR:      1.612
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.80         27.77        4.7213    1   1   1         8
                30.93         32.51        2.8912    2   2   0        12
                36.44        100.00        2.4656    3   1   1        24
                38.12          1.27        2.3607    2   2   2         8
                44.31         54.23        2.0444    4   0   0         6
                55.01          8.59        1.6692    4   2   2        24
                58.66          3.28        1.5738    3   3   3         8
                58.66         35.47        1.5738    5   1   1        24
                64.46         61.65        1.4456    4   4   0        12
                67.80          2.33        1.3823    5   3   1        48
                73.20          2.52        1.2930    6   2   0        24
                76.37          7.87        1.2471    5   3   3        24
                81.56          5.16        1.1803    4   4   4         8
                84.63          1.67        1.1451    5   5   1        24
                89.73          3.42        1.0928    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.