Corundum
      Tsirelson V, Antipin M, Gerr R, Ozerov R, Struchkov Y
      Physica Status Solidi A87 (1985) 425-433
      Ruby structure peculiarities derived from X-ray data. Localization of
      chromium atoms and electron deformation density
      _cod_database_code 1000017
      _database_code_amcsd 0015110

      CELL PARAMETERS:    4.7606   4.7606  12.9940   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    255.033
      Density (g/cm3):      3.983
      MAX. ABS. INTENSITY / VOLUME**2:      11.53837108    
      RIR:      0.943
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                25.59         64.20        3.4811    0   1   2         6
                35.17        100.00        2.5516    1   0   4         6
                37.79         46.82        2.3803    1   1   0         6
                43.38         97.40        2.0860    1   1   3        12
                46.20          1.55        1.9649    2   0   2         6
                52.58         49.44        1.7405    0   2   4         6
                57.54         96.37        1.6019    1   1   6        12
                59.77          2.35        1.5472    2   1   1        12
                61.16          3.29        1.5153    1   2   2        12
                61.35          7.32        1.5112    0   1   8         6
                66.56         38.02        1.4050    2   1   4        12
                68.25         56.83        1.3743    3   0   0         6
                70.46          1.12        1.3364    1   2   5        12
                74.35          1.50        1.2758    2   0   8         6
                76.93         16.51        1.2393    1   0  10         6
                77.29          8.00        1.2344    1   1   9        12
                80.74          2.23        1.1902    2   2   0         6
                84.41          1.54        1.1476    2   2   3        12
                86.40          1.22        1.1262    3   1   2        12
                86.56          2.80        1.1245    1   2   8        12
                89.07          7.73        1.0992    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.