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 = 220 K
_database_code_amcsd 0006205
9.9751 9.9751 8.3658 90 90 120 P6_3
atom     x     y     z occ Uiso
K        0     0 .0031 .57 .028
Na1      0     0 .0031 .24 .028
Na2  .5547 .9979 .5081     .020
Al1    2/3   1/3 .7017 .48 .011
Si1    2/3   1/3 .7017 .52 .011
Al2    2/3   1/3 .3124 .48 .012
Si2    2/3   1/3 .3124 .52 .012
Al3  .9066 .6664 .8226 .48 .011
Si3  .9066 .6664 .8226 .52 .011
Al4  .9071 .6679 .1958 .48 .010
Si4  .9071 .6679 .1958 .52 .010
O1   .6640 .2910 .5023 1/3 .028
O2   .9743 .6842 .0022     .028
O3   .8272 .4773 .2512     .033
O4   .8373 .4896 .7645     .029
O5   .7739 .7145 .8252     .016
O6   .7767 .7335 .2007     .018