Heulandite-Na
      Gunter M E, Armbruster T, Kohler T, Knowles C R
      American Mineralogist 79 (1994) 675-682
      Crystal structure and optical properties of Na- and Pb-exchanged
      heulandite-group zeolites
      Sample: Na-exchanged
      Atomic parameters from ICSD
      _database_code_amcsd 0001669

      CELL PARAMETERS:   17.7670  17.9770   7.4220   90.000  116.140   90.000
      SPACE GROUP: C2/m      
      X-RAY WAVELENGTH:     1.541838
      Cell Volume:   2128.106
      Density (g/cm3):      2.133
      MAX. ABS. INTENSITY / VOLUME**2:      5.050714262    
      RIR:      0.771
      RIR based on corundum from Acta Crystallographica A38 (1982) 733-739
               2-THETA      INTENSITY    D-SPACING   H   K   L   Multiplicity
                 7.41          1.44       11.9308    1   1   0         4
                 9.84        100.00        8.9885    0   2   0         2
                11.09         36.54        7.9749    2   0   0         2
                12.91          4.30        6.8584   -1   1   1         4
                13.03         22.42        6.7937   -2   0   1         2
                13.29         12.04        6.6629    0   0   1         2
                14.85          3.65        5.9654    2   2   0         4
                15.80          2.31        5.6095    1   3   0         4
                16.36          3.88        5.4198   -2   2   1         4
                16.56          5.34        5.3527    0   2   1         4
                16.85         18.18        5.2614   -3   1   1         4
                17.25         28.44        5.1406    1   1   1         4
                17.39          8.38        5.0983    3   1   0         4
                19.04         16.23        4.6618   -1   3   1         4
                20.30          5.94        4.3746   -4   0   1         2
                22.24         50.20        3.9969    1   3   1         4
                22.30         19.55        3.9874    4   0   0         2
                22.35         33.61        3.9769    3   3   0         4
                22.60         19.98        3.9335   -4   2   1         4
                22.71         29.68        3.9153    2   4   0         4
                23.06          8.92        3.8573    2   2   1         4
                23.74          1.12        3.7483   -2   4   1         4
                23.99          7.81        3.7098   -2   0   2         2
                25.00         15.80        3.5618   -3   1   2         4
                25.28          3.30        3.5236   -1   1   2         4
                25.58          3.47        3.4829   -5   1   1         4
                25.98         30.77        3.4292   -2   2   2         4
                26.11          2.83        3.4125    3   1   1         4
                26.24         18.59        3.3968   -4   0   2         2
                26.76          9.47        3.3314    0   0   2         2
                28.08         22.88        3.1775   -4   2   2         4
                28.47         18.17        3.1348   -4   4   1         4
                28.73          1.51        3.1071   -3   3   2         4
                28.97         10.83        3.0817   -1   3   2         4
                29.43          1.96        3.0351   -5   1   2         4
                29.68         10.84        3.0098   -3   5   1         4
                29.71          2.67        3.0066    3   3   1         4
                29.82          1.71        2.9962    0   6   0         2
                29.92         28.68        2.9867    1   5   1         4
                30.00         22.00        2.9783    3   5   0         4
                30.14         12.75        2.9655    1   1   2         4
                30.21          3.43        2.9580   -6   0   1         2
                30.79          3.04        2.9039    4   0   1         2
                31.78         22.82        2.8158    5   3   0         4
                31.85         10.18        2.8098   -6   2   1         4
                32.40          2.59        2.7633    4   2   1         4
                32.55          1.42        2.7512   -6   0   2         2
                32.67          7.43        2.7414   -2   6   1         4
                32.77          5.13        2.7326    0   6   1         4
                33.34          2.59        2.6874    1   3   2         4
                33.48          3.99        2.6763    0   4   2         4
                34.91          4.04        2.5703    2   2   2         4
                35.21          1.53        2.5492    6   2   0         4
                35.31          3.96        2.5416   -1   5   2         4
                35.40          1.50        2.5355    1   7   0         4
                35.54          3.32        2.5262   -5   5   1         4
                35.94          2.41        2.4989    3   5   1         4
                35.94          2.86        2.4985   -7   1   1         4
                36.34          1.37        2.4720   -4   6   1         4
                36.36          2.66        2.4708   -6   4   1         4
                36.54          1.85        2.4592    5   1   1         4
                36.64          5.56        2.4527    2   6   1         4
                36.85          3.14        2.4391    4   4   1         4
                36.92          3.65        2.4346   -2   0   3         2
                37.04          4.74        2.4273   -7   1   2         4
                37.55          1.92        2.3953    4   6   0         4
                38.00          1.98        2.3681    3   1   2         4
                38.02          1.92        2.3669   -4   2   3         4
                38.15          2.22        2.3588   -5   1   3         4
                39.38          1.91        2.2880    6   4   0         4
                41.10          1.88        2.1959   -6   2   3         4
                42.37          1.10        2.1334   -2   8   1         4
                42.44          1.65        2.1298    7   3   0         4
                42.97          1.32        2.1050   -6   6   1         4
                43.01          2.13        2.1028    6   2   1         4
                43.13          1.71        2.0972   -3   7   2         4
                43.39          3.19        2.0852    4   6   1         4
                43.83          1.93        2.0655    3   7   1         4
                44.34          1.33        2.0429    5   5   1         4
                44.77          2.34        2.0245   -7   5   2         4
                44.82          3.45        2.0223   -6   4   3         4
                45.62          1.23        1.9885    6   6   0         4
                45.78          1.24        1.9820    1   9   0         4
                46.04          2.78        1.9715   -8   4   1         4
                46.16          1.33        1.9667   -8   4   2         4
                46.21          5.68        1.9644   -1   5   3         4
                46.52          2.49        1.9523   -9   1   2         4
                46.60          1.22        1.9489    6   4   1         4
                47.63          1.10        1.9091    5   1   2         4
                48.70          1.02        1.8698    3   9   0         4
                48.80          1.02        1.8663   -9   3   2         4
                49.12          1.27        1.8549   -4   0   4         2
                49.90          1.98        1.8276   -3   1   4         4
                50.21          1.25        1.8169   -6   0   4         2
                50.79          1.66        1.7977    0  10   0         2
                51.20          1.26        1.7842    0   6   3         4
                51.42          1.54        1.7772    4   8   1         4
                51.56          4.79        1.7726   -7   7   2         4
                52.07          3.67        1.7564   -3   3   4         4
                52.26          1.57        1.7504   -3   9   2         4
                52.74          3.62        1.7356    0  10   1         4
                52.87          1.98        1.7318    3   9   1         4
                53.47          1.78        1.7135    3   3   3         4
                53.78          2.21        1.7044    7   7   0         4
                54.02          2.56        1.6974  -10   0   3         2
                55.02          2.53        1.6689   -8   2   4         4
                55.35          2.80        1.6598    8   6   0         4
                56.12          1.33        1.6388    4  10   0         4
                56.72          3.54        1.6231    2   6   3         4
                57.55          1.02        1.6014    8   4   1         4
                57.57          3.18        1.6011    3   5   3         4
                57.80          1.69        1.5951   -6   8   3         4
                57.81          1.32        1.5950   10   0   0         2
                58.83          1.03        1.5698   -8   8   1         4
                60.58          1.11        1.5285    4  10   1         4
                62.25          1.38        1.4914    8   8   0         4
                62.42          1.11        1.4877    8   6   1         4
                63.15          1.14        1.4723    2  12   0         4
                63.78          2.06        1.4594  -12   2   2         4
                64.56          1.36        1.4436   -5  11   2         4
                64.73          1.78        1.4402  -11   5   3         4
                64.73          1.70        1.4401    1   9   3         4
                65.76          1.50        1.4200   -2   0   5         2
                65.90          1.37        1.4173   -4  12   1         4
                66.00          1.38        1.4155  -11   3   4         4
                66.88          1.15        1.3990   10   2   1         4
                67.34          1.67        1.3905   -8  10   1         4
                68.39          1.39        1.3717   -5   5   5         4
                69.09          1.40        1.3595   -7  11   2         4
                69.23          1.84        1.3572   -7   5   5         4
                69.77          1.08        1.3479    7   7   2         4
                72.23          1.54        1.3079    2  12   2         4
                74.16          1.32        1.2786   -4  12   3         4
                74.69          1.22        1.2708   -2  10   4         4
                75.71          1.66        1.2562   -9  11   2         4
================================================================================
       XPOW Copyright 1993 Bob Downs, Ranjini Swaminathan and Kurt Bartelmehs
  For reference, see Downs et al. (1993) American Mineralogist 78, 1104-1107.