Heulandite-Ca
Merkle A B, Slaughter M
American Mineralogist 52 (1967) 273-276
The crystal structure of heulandite (Ca,Na2)[Al2Si7O18].6H2O
_database_code_amcsd 0000154
17.73 17.82 7.43 90 116.33 90 Cm
atom     x    y    z  occ
Ca1   .147    0 .811
Ca2   .435    0 .147
Ca3   .242   .5 .300
Si1   .109 .168 .405 .733
Al1   .109 .168 .405 .267
Si2   .002 .093    0 .733
Al2   .002 .093    0 .267
Si3   .080 .184 .782 .733
Al3   .080 .184 .782 .267
Si4   .342 .304 .909 .733
Al4   .342 .304 .909 .267
Si5   .287 .216   .5 .733
Al5   .287 .216   .5 .267
Si6   .495 .198 .216 .733
Al6   .495 .198 .216 .267
Si7   .468 .173 .593 .733
Al7   .468 .173 .593 .267
Si8   .216 .302 .086 .733
Al8   .216 .302 .086 .267
Si9   .072 .415    0 .733
Al9   .072 .415    0 .267
O1    .983    0 .947
O2    .061 .130 .900
O3    .102 .143 .605
O4    .044 .122 .235
O5    .292 .338 .018
O6    .211 .167 .428
O7    .142 .256 .943
O8    .295 .259 .679
O9    .084 .247 .314
O10   .279 .283 .313
O11   .370 .151 .559
O12   .023 .404 .753
O13   .081   .5 .044
O14   .463 .162 .362
O15   .492 .263 .663
O16   .404 .376 .906
O17   .020 .380 .117
O18   .170 .383 .109
O19   .407 .233 .055
Wat1  .006    0 .528 .667
Wat2  .294   .5 .038 .667
Wat3  .296   .5 .767 .667
Wat4  .065   .5 .518 .667
Wat5  .386    0 .772 .667
Wat6  .209    0 .601 .667
Wat7  .256 .137 .005 .667
Wat8  .211 .423 .509 .667
Wat9  .360 .424 .469 .667
Wat10 .389    0 .404 .667
Wat11 .379    0 .291 .667
Wat12 .208    0 .450 .667
Wat13 .375    0 .520 .667
Wat14 .222 .172 .109 .667