Nepheline
Angel R J, Gatta G C, Boffa Ballaran T, Carpenter M A
The Canadian Mineralogist 46 (2008) 1465-1476
The mechanism of coupling in the modulated structure of nepheline
Locality: Snipe River, Tambani, Malawi
Note: annealed
Note: T = 298 K
_database_code_amcsd 0006209
9.9867 9.9861 8.3697 90 90 120 P6_3
atom     x     y     z occ Uiso
K        0     0 .0030 .57 .032
Na1      0     0 .0030 .24 .032
Na2  .5545 .9980 .5080     .024
Al1    2/3   1/3 .7018 .48 .012
Si1    2/3   1/3 .7018 .52 .012
Al2    2/3   1/3 .3123 .48 .013
Si2    2/3   1/3 .3123 .52 .013
Al3  .9063 .6665 .8226 .48 .012
Si3  .9063 .6665 .8226 .52 .012
Al4  .9067 .6680 .1959 .48 .010
Si4  .9067 .6680 .1959 .52 .010
O1   .6660 .2950 .5021 1/3 .030
O2   .9739 .6845 .0022     .028
O3   .8267 .4773 .2508     .033
O4   .8371 .4898 .7651     .030
O5   .7739 .7148 .8246     .018
O6   .7764 .7334 .2008     .021