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 = 200 K
_database_code_amcsd 0006203
9.9890 9.9890 8.3687 90 90 120 P6_3
atom     x     y     z occ Uiso
K        0     0 .0034 .57 .028
Na1      0     0 .0034 .24 .028
Na2  .5545 .9972 .5081     .021
Al1    2/3   1/3 .7014 .48 .012
Si1    2/3   1/3 .7014 .52 .012
Al2    2/3   1/3 .3134 .48 .013
Si2    2/3   1/3 .3134 .52 .013
Al3  .9061 .6660 .8223 .48 .013
Si3  .9061 .6660 .8223 .52 .013
Al4  .9068 .6675 .1959 .48 .011
Si4  .9068 .6675 .1959 .52 .011
O1   .6620 .2858 .5015 1/3 .028
O2   .9734 .6830 .0027     .033
O3   .8269 .4775 .2516     .037
O4   .8373 .4896 .7629     .033
O5   .7736 .7145 .8249     .018
O6   .7765 .7330 .2011     .021