Gonnardite
Evans H T, Konnert J A, Ross M
American Mineralogist 85 (2000) 1808-1815
The crystal structure of tetranatrolite from Mont Saint-Hilaire, Quebec, and its
chemical and structural relationship to paranatrolite and gonnardite
_database_code_amcsd 0002597
13.197 13.197 6.630 90 90 90 I-42d
atom     x     y     z occ  Uiso
Si1      0     0     0 .57 .0225
Al1      0     0     0 .43 .0225
Si2  .0544 .1330 .6214 .57 .0214
Al2  .0544 .1330 .6214 .43 .0214
O1   .3944   .25  .125      .022
O2   .1333 .0627 .4813      .032
O3   .0506 .0918 .8603      .015
Na   .6914   .25  .125 .85  .032
Ca   .6914   .25  .125 .15  .032
Wat4 .1334   .25  .125      .047
Wat5  .872  .260  .182 .18  .033