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 = 1532 K on cooling cycle, MgAl2O4
      _database_code_amcsd 0002127

      CELL PARAMETERS:    8.1736   8.1736   8.1736   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    546.060
      Density (g/cm3):      3.460
      MAX. ABS. INTENSITY / VOLUME**2:      17.06049633    
      RIR:      1.605
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.80         28.36        4.7190    1   1   1         8
                30.94         32.40        2.8898    2   2   0        12
                36.46        100.00        2.4644    3   1   1        24
                38.14          1.22        2.3595    2   2   2         8
                44.33         54.55        2.0434    4   0   0         6
                55.04          8.42        1.6684    4   2   2        24
                58.69         35.43        1.5730    5   1   1        24
                58.69          3.24        1.5730    3   3   3         8
                64.49         61.36        1.4449    4   4   0        12
                67.83          2.46        1.3816    5   3   1        48
                73.24          2.43        1.2924    6   2   0        24
                76.41          7.81        1.2465    5   3   3        24
                81.61          5.24        1.1798    4   4   4         8
                84.69          1.74        1.1445    5   5   1        24
                89.79          3.28        1.0922    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.