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: M-Cr, 3rd run, T = 550 C
      _database_code_amcsd 0008788

      CELL PARAMETERS:    8.1379   8.1379   8.1379   90.000   90.000   90.000
      SPACE GROUP: Fd3m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    538.936
      Density (g/cm3):      3.589
      MAX. ABS. INTENSITY / VOLUME**2:      19.14430515    
      RIR:      1.737
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                18.89         40.85        4.6984    1   1   1         8
                31.08         31.66        2.8772    2   2   0        12
                36.62        100.00        2.4537    3   1   1        24
                44.53         56.93        2.0345    4   0   0         6
                55.30          8.03        1.6611    4   2   2        24
                58.98          2.76        1.5661    3   3   3         8
                58.98         42.64        1.5661    5   1   1        24
                64.81         66.41        1.4386    4   4   0        12
                68.17          3.82        1.3756    5   3   1        48
                73.62          2.25        1.2867    6   2   0        24
                76.81          9.22        1.2410    5   3   3        24
                77.86          1.24        1.2268    6   2   2        24
                82.04          6.27        1.1746    4   4   4         8
                85.14          3.01        1.1395    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.