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 = 110 K
_database_code_amcsd 0006202
9.9820 9.9820 8.3670 90 90 120 P6_3
atom     x     y     z occ Uiso
K        0     0 .0031 .57 .024
Na1      0     0 .0031 .24 .024
Na2  .5547 .9971 .5082     .017
Al1    2/3   1/3 .7014 .48 .010
Si1    2/3   1/3 .7014 .52 .010
Al2    2/3   1/3 .3137 .48 .012
Si2    2/3   1/3 .3137 .52 .012
Al3  .9064 .6660 .8222 .48 .012
Si3  .9064 .6660 .8222 .52 .012
Al4  .9071 .6672 .1959 .48 .010
Si4  .9071 .6672 .1959 .52 .010
O1   .6611 .2825 .5005 1/3 .024
O2   .9734 .6822 .0022     .034
O3   .8270 .4774 .2518     .038
O4   .8374 .4891 .7613     .032
O5   .7736 .7143 .8253     .016
O6   .7765 .7329 .2012     .018