Heulandite
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: Pb-exchanged
Atomic parameters from ICSD
17.767 17.917 7.432 90 116.33 90 Cm
atom      x      y     z  occ Biso
Si1   .1796  .1695  .091 .753 1.04
Al1   .1796  .1695  .091 .247 1.04
Si2   .8222  .8315 -.094 .753 1.01
Al2   .8222  .8315 -.094 .247 1.01
Si3   .2874  .0894  .493 .753  .98
Al3   .2874  .0894  .493 .247  .98
Si4   .7161 -.0903  .503 .753 1.38
Al4   .7161 -.0903  .503 .247 1.38
Si5   .2961  .3081  .288 .753 1.03
Al5   .2961  .3081  .288 .247 1.03
Si6   .7105  .6919  .718 .753 1.04
Al6   .7105  .6919  .718 .247 1.04
Si7   .0670  .2991  .417 .753  .94
Al7   .0670  .2991  .417 .247  .94
Si8  -.0634  .6980  .589 .753  1.1
Al8  -.0634  .6980  .589 .247  1.1
Si9       0  .2160     0 .753  1.3
Al9       0  .2160     0 .247  1.3
O1     .299      0  .555       2.4
O2     .199     .5  .458       2.2
O3    .2351  .1248  .613       2.5
O4    .7762   .877  .403       2.6
O5     .188  .1508  .885       3.2
O6    .8193  .8482  .117       1.8
O7     .231  .1017  .245       3.2
O8    .7611  .8948  .752       1.2
O9        0   .328    .5       2.3
O10    .082  .1623  .047       2.9
O11  -.0824  .8414 -.067       1.2
O12   .3807  .2654  .453       2.5
O13    .631  .7368  .558       2.7
O14   .0099  .2643  .194       2.7
O15  -.0123  .7257  .817       2.5
O16   .2118  .2526  .178       2.3
O17   .7891  .7478  .829       2.2
O18   .1187  .3726  .401       1.5
O19    .882   .625   .58       3.3
Pb1   .1505      0  .679  .32  5.4
Pb2    .852      0  .327   .4  4.4
Pb3   .0381     .5 .1979   .6 2.97
Pb4    .217      0  .877  .14  6.4
Pb5    .794      0   .14  .12  4.9
Pb6   -.011  .0768  .667  .14 12.7
Pb7    .009     .9  .484  .07 12.7
O20   .4218  .0873  .034       2.9
O21    .017   .074  .322  .76   2.
O22    .499      0  .502       8.4
O23   -.076      0  .121  .88 7.61
O24    .077      0  .268 1.14 9.29
O25    .274      0 -.004   .6  2.2
O26    .724      0 -.018  .86  8.7
O27     .29      0   .25  .22 6.32