Thallium
      Wyckoff R W G
      Crystal Structures 1 (1963) 7-83
      Second edition. Interscience Publishers, New York, New York
      Sample at T = 5 K
      Hexagonal closest packed, hcp, structure
      _database_code_amcsd 0011196

      CELL PARAMETERS:    3.4380   3.4380   5.4780   90.000   90.000  120.000
      SPACE GROUP: P6_3/mmc  
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:     56.074
      Density (g/cm3):     12.103
      MAX. ABS. INTENSITY / VOLUME**2:      1042.501767    
      RIR:     28.046
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                30.01         23.85        2.9774    1   0   0         6
                32.69         25.29        2.7390    0   0   2         2
                34.28        100.00        2.6160    1   0   1        12
                44.97         15.16        2.0158    1   0   2        12
                53.29         17.76        1.7190    1   1   0         6
                59.37         18.67        1.5566    1   0   3        12
                62.38          2.64        1.4887    2   0   0         6
                63.94         19.44        1.4560    1   1   2        12
                64.91         13.87        1.4366    2   0   1        12
                68.52          2.57        1.3695    0   0   4         2
                72.23          3.25        1.3080    2   0   2        12
                76.58          2.70        1.2442    1   0   4        12
                83.85          6.21        1.1538    2   0   3        12
                88.75          3.59        1.1023    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.