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 = 15 K
_database_code_amcsd 0006208
9.9801 9.9801 8.3707 90 90 120 P6_3
atom     x     y     z occ Uiso
K        0     0 .0037 .57 .022
Na1      0     0 .0037 .24 .022
Na2  .5554 .9976 .5086     .017
Al1    2/3   1/3 .7010 .48 .012
Si1    2/3   1/3 .7010 .52 .012
Al2    2/3   1/3 .3136 .48 .014
Si2    2/3   1/3 .3136 .52 .014
Al3  .9067 .6658 .8222 .48 .014
Si3  .9067 .6658 .8222 .52 .014
Al4  .9073 .6671 .1961 .48 .012
Si4  .9073 .6671 .1961 .52 .012
O1   .6602 .2797 .5053 1/3 .023
O2   .9732 .6814 .0034     .035
O3   .8287 .4781 .2515     .038
O4   .8365 .4889 .7610     .034
O5   .7746 .7152 .8251     .019
O6   .7762 .7315 .2007     .020