H11 I N2 O6
      Helmholz L
      Journal of the American Chemical Society 59 (1937) 2036-2039
      The Crystal Structure of Ammonium Trihydrogen Paraperiodate, (NH4)2 H3 I O6
      _cod_database_code 1010098
      _database_code_amcsd 0017031

      CELL PARAMETERS:    6.8800   6.8800  11.1000   90.000   90.000  120.000
      SPACE GROUP: R-3       
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:    455.020
      Density (g/cm3):      2.747
      MAX. ABS. INTENSITY / VOLUME**2:      79.28366448    
      RIR:      9.399
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                16.89        100.00        5.2498    1   0   1         6
                21.89         35.48        4.0611    0   1   2         6
                24.05          8.07        3.7000    0   0   3         2
                25.90         27.88        3.4400    1   1   0         6
                31.08          5.68        2.8773    0   2   1         6
                34.16         10.31        2.6249    2   0   2         6
                35.64          8.03        2.5194    2  -1   3         6
                35.64         28.92        2.5194    1   1   3         6
                35.69          3.21        2.5156    1   0   4         6
                40.89          6.56        2.2070    2   1   1         6
                43.36          9.55        2.0868    1   2   2         6
                43.50          2.11        2.0803    0   1   5         6
                44.63          5.35        2.0306    0   2   4         6
                45.68          6.96        1.9861    3   0   0         6
                51.33          4.21        1.7801    2   0   5         6
                52.28          3.69        1.7499    0   3   3         6
                52.28          5.04        1.7499    3   0   3         6
                52.32          2.44        1.7486    3  -1   4         6
                52.32          6.21        1.7486    2   1   4         6
                53.26          2.66        1.7200    2   2   0         6
                56.28          1.52        1.6345   -1   4   1         6
                56.28          3.20        1.6345    1   3   1         6
                56.48          2.43        1.6293    1   1   6         6
                56.48          5.60        1.6293    2  -1   6         6
                58.25          2.52        1.5838    3   1   2         6
                58.25          1.56        1.5838    4  -1   2         6
                58.37          3.71        1.5810   -1   3   5         6
                58.37          2.65        1.5810    1   2   5         6
                59.24          2.12        1.5597    4  -2   3         6
                59.24          4.58        1.5597    2   2   3         6
                60.41          1.29        1.5324    1   0   7         6
                62.96          2.87        1.4763    4   0   1         6
                64.80          1.60        1.4386    0   4   2         6
                66.84          1.26        1.3998    0   2   7         6
                69.26          1.21        1.3567    5  -2   1         6
                69.43          1.42        1.3537    3   0   6         6
                69.43          1.76        1.3537    0   3   6         6
                69.57          1.47        1.3513    0   1   8         6
                71.02          1.45        1.3273   -2   5   2         6
                72.73          2.63        1.3002    1   4   0         6
                72.73          1.81        1.3002    4   1   0         6
                72.97          1.59        1.2965    3  -1   7         6
                75.47          1.90        1.2597    4  -2   6         6
                75.47          1.13        1.2597    2   2   6         6
                77.87          1.17        1.2267   -1   5   3         6
                81.18          1.07        1.1848    0   5   1         6
                81.48          1.02        1.1813   -1   3   8         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.