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 = 100 K
_database_code_amcsd 0006207
9.9685 9.9685 8.3608 90 90 120 P6_3
atom     x     y     z occ Uiso
K        0     0 .0028 .57 .022
Na1      0     0 .0028 .24 .022
Na2  .5551 .9976 .5085     .015
Al1    2/3   1/3 .7017 .48 .009
Si1    2/3   1/3 .7017 .52 .009
Al2    2/3   1/3 .3124 .48 .010
Si2    2/3   1/3 .3124 .52 .010
Al3  .9067 .6661 .8225 .48 .010
Si3  .9067 .6661 .8225 .52 .010
Al4  .9074 .6675 .1958 .48 .008
Si4  .9074 .6675 .1958 .52 .008
O1   .6605 .2846 .5008 1/3 .021
O2   .9743 .6830 .0023     .029
O3   .8273 .4771 .2518     .033
O4   .8379 .4894 .7624     .034
O5   .7736 .7141 .8257     .014
O6   .7769 .7333 .2011     .015