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 = 150 K
_database_code_amcsd 0006206
9.9698 9.9698 8.3615 90 90 120 P6_3
atom     x     y     z occ Uiso
K        0     0 .0029 .57 .024
Na1      0     0 .0029 .24 .024
Na2  .5550 .9978 .5082     .017
All    2/3   1/3 .7017 .48  .01
Sil    2/3   1/3 .7017 .52  .01
Al2    2/3   1/3 .3124 .48 .011
Si2    2/3   1/3 .3124 .52 .011
Al3  .9067 .6662 .8226 .48 .010
Si3  .9067 .6662 .8226 .52 .010
Al4  .9073 .6677 .1958 .48 .009
Si4  .9073 .6677 .1958 .52 .009
O1   .6623 .2875 .5015 1/3 .024
O2   .9745 .6837 .0023     .028
O3   .8273 .4771 .2517     .033
O4   .8377 .4894 .7635     .029
O5   .7739 .7143 .8255     .014
O6   .7767 .7333 .2008     .016