Corundum
      d'Amour H, Schiferl D, Denner W, Schulz H, Holzapfel W B
      Journal of Applied Physics 49 (1978) 4411-4416
      High-pressure single-crystal structure determinations for ruby up to 90 kbar
      using an automatic diffractometer
      P = 42 kbar
      _database_code_amcsd 0012916

      CELL PARAMETERS:    4.7418   4.7418  12.9210   90.000   90.000  120.000
      SPACE GROUP: R-3c      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    251.601
      Density (g/cm3):      4.037
      MAX. ABS. INTENSITY / VOLUME**2:      12.60064639    
      RIR:      1.016
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                25.71         62.09        3.4657    0   1   2         6
                35.35         94.86        2.5389    1   0   4         6
                37.95         44.51        2.3709    1   1   0         6
                43.58         98.38        2.0770    1   1   3        12
                46.40          1.48        1.9568    2   0   2         6
                52.83         49.70        1.7328    0   2   4         6
                57.84        100.00        1.5941    1   1   6        12
                60.03          2.62        1.5410    2   1   1        12
                61.44          3.36        1.5092    1   2   2        12
                61.71          7.34        1.5030    0   1   8         6
                66.88         39.64        1.3990    2   1   4        12
                68.55         61.30        1.3688    3   0   0         6
                70.82          1.32        1.3306    1   2   5        12
                74.79          1.45        1.2694    2   0   8         6
                77.43         17.89        1.2325    1   0  10         6
                77.77          9.49        1.2281    1   1   9        12
                81.13          2.34        1.1854    2   2   0         6
                84.83          1.91        1.1429    2   2   3        12
                86.84          1.44        1.1216    3   1   2        12
                87.08          2.92        1.1191    1   2   8        12
                89.65          8.55        1.0936    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.