Corundum
      Kirfel A, Eichhorn K
      Acta Crystallographica A46 (1990) 271-284
      Accurate structure analysis with synchrotron radiation.
      The electron density in Al2O3 and Cu2O
      Locality: synthetic
      _database_code_amcsd 0009327

      CELL PARAMETERS:    4.7570   4.7570  12.9877   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    254.524
      Density (g/cm3):      3.991
      MAX. ABS. INTENSITY / VOLUME**2:      12.28406986    
      RIR:      1.002
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                25.61         61.73        3.4787    0   1   2         6
                35.19         96.62        2.5501    1   0   4         6
                37.82         44.54        2.3785    1   1   0         6
                43.41         99.77        2.0846    1   1   3        12
                46.24          1.46        1.9634    2   0   2         6
                52.62         50.08        1.7394    0   2   4         6
                57.57        100.00        1.6009    1   1   6        12
                59.82          2.60        1.5460    2   1   1        12
                61.21          3.30        1.5142    1   2   2        12
                61.38          7.62        1.5104    0   1   8         6
                66.61         39.73        1.4040    2   1   4        12
                68.30         61.41        1.3732    3   0   0         6
                70.51          1.31        1.3355    1   2   5        12
                74.40          1.53        1.2750    2   0   8         6
                76.98         17.78        1.2387    1   0  10         6
                77.34          9.61        1.2338    1   1   9        12
                80.82          2.30        1.1892    2   2   0         6
                84.48          1.92        1.1468    2   2   3        12
                86.48          1.40        1.1253    3   1   2        12
                86.63          3.02        1.1238    1   2   8        12
                89.13          8.40        1.0986    0   2  10         6
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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.