I4 Si
      Hassel O, Kringstad H
      Zeitschrift fur Physikalische Chemie B13 (1931) 1-12
      Bemerkungen ueber den Kristallbau der Tetrahalogenide leichterer Elemente
      _cod_database_code 1010051
      _database_code_amcsd 0016987

      CELL PARAMETERS:   11.9860  11.9860  11.9860   90.000   90.000   90.000
      SPACE GROUP: Pa3       
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   1721.959
      Density (g/cm3):      4.132
      MAX. ABS. INTENSITY / VOLUME**2:      204.3258790    
      RIR:     16.101
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                12.79          1.98        6.9201    1   1   1         8
                16.54          4.30        5.3603    2   1   0        12
                18.13          2.54        4.8933    2   1   1        24
                25.75        100.00        3.4601    2   2   2         8
                29.82         44.21        2.9965    4   0   0         6
                34.28          1.25        2.6156    4   1   2        24
                40.53          1.10        2.2257    4   3   2        24
                42.67         37.86        2.1188    4   4   0        12
                50.51         38.05        1.8070    6   2   2        24
                52.92          9.47        1.7300    4   4   4         8
                55.84          1.15        1.6464    6   1   4        24
                61.93          5.14        1.4983    8   0   0         6
                68.21         12.69        1.3749    6   6   2        24
                70.24          4.95        1.3401    8   0   4        12
                70.24          4.95        1.3401    8   4   0        12
                78.13          8.81        1.2233    8   4   4        24
                83.89          2.02        1.1534    6   6   6         8
                83.89          6.01        1.1534   10   2   2        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.