Thallium
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Sample at T = 297 K
      Hexagonal closest packed, hcp, structure
      _database_code_amcsd 0011197

      CELL PARAMETERS:    3.4560   3.4560   5.5250   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     57.149
      Density (g/cm3):     11.876
      MAX. ABS. INTENSITY / VOLUME**2:      1020.840542    
      RIR:     27.990
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                29.85         23.78        2.9930    1   0   0         6
                32.41         25.47        2.7625    0   0   2         2
                34.07        100.00        2.6317    1   0   1        12
                44.64         15.24        2.0300    1   0   2        12
                52.99         17.78        1.7280    1   1   0         6
                58.88         18.87        1.5685    1   0   3        12
                62.02          2.65        1.4965    2   0   0         6
                63.50         19.56        1.4650    1   1   2        12
                64.51         13.91        1.4444    2   0   1        12
                67.85          2.61        1.3813    0   0   4         2
                71.73          3.27        1.3158    2   0   2        12
                75.86          2.73        1.2541    1   0   4        12
                83.18          6.25        1.1614    2   0   3        12
                88.15          3.58        1.1082    2   1   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.