Gonnardite
Artioli G, Galli E
American Mineralogist 84 (1999) 1445-1450
Gonnardite: Re-examination of holotype material, and discreditation of
tetranatrolite
_database_code_amcsd 0002315
13.2670 13.2670 6.6023 90 90 90 I-42d
atom     x     y     z occ Uiso
Si1      0     0     0 .57 .025
Al1      0     0     0 .43 .025
Si2  .1319 .0512 .3845 .57 .029
Al2  .1319 .0512 .3845 .43 .029
Ca   .3005   .25  .125 .23 .013
Na   .3005   .25  .125 .58 .013
O1     .25 .0949  .375     .031
O2   .0903 .4478  .101     .029
O3   .4373 .3721  .026     .027
OW1    .25 .3651  .375     .046
OW2   .139  .235  .051 .35 .037