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: natural sample
Note: T = 290 K
_database_code_amcsd 0006204
9.9995 9.9995 8.3766 90 90 120 P6_3
atom     x     y     z occ Uiso
K        0     0 .0037 .57 .033
Na1      0     0 .0037 .24 .033
Na2  .5541 .9972 .5080     .025
Al1    2/3   1/3 .7015 .48 .013
Si1    2/3   1/3 .7015 .52 .013
Al2    2/3   1/3 .3132 .48 .014
Si2    2/3   1/3 .3132 .52 .014
Al3  .9057 .6661 .8224 .48 .014
Si3  .9057 .6661 .8224 .52 .014
Al4  .9064 .6676 .1959 .48 .012
Si4  .9064 .6676 .1959 .52 .012
O1   .6620 .2891 .5013 1/3 .033
O2   .9729 .6835 .0027     .034
O3   .8265 .4775 .2514     .038
O4   .8367 .4898 .7642     .034
O5   .7737 .7147 .8241     .020
O6   .7760 .7329 .2011     .023