Spinel
      Martignago F, Dal Negro A, Carbonin S
      Physics and Chemistry of Minerals 30 (2003) 401-408
      How Cr3+ and Fe3+ affect Mg-Al order-disorder transformation at high temperature
      in natural spinels
      Sample: H-Cr, 3rd run, T = 550 C
      _database_code_amcsd 0008803

      CELL PARAMETERS:    8.1445   8.1445   8.1445   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    540.248
      Density (g/cm3):      3.606
      MAX. ABS. INTENSITY / VOLUME**2:      19.51558960    
      RIR:      1.762
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.87         42.84        4.7022    1   1   1         8
                31.06         31.01        2.8795    2   2   0        12
                36.59        100.00        2.4557    3   1   1        24
                44.50         57.82        2.0361    4   0   0         6
                55.25          7.78        1.6625    4   2   2        24
                58.92         42.98        1.5674    5   1   1        24
                58.92          2.69        1.5674    3   3   3         8
                64.75         66.82        1.4398    4   4   0        12
                68.11          4.10        1.3767    5   3   1        48
                73.55          2.14        1.2878    6   2   0        24
                76.73          9.21        1.2420    5   3   3        24
                77.79          1.24        1.2278    6   2   2        24
                81.96          6.53        1.1756    4   4   4         8
                85.06          3.23        1.1405    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.