Nepheline
Buerger M J, Klein G E, Hamburger G E
American Mineralogist 32 (1947) 197-197
The structure of nepheline
_database_code_amcsd 0000040
10.05 10.05 8.38 90 90 120 P6_3
atom     x     y   z
K        0     0   0
Na   .0100 .4300   0
Si1    1/3   2/3 .82
Al1    1/3   2/3 .18
Si2  .0900 .3300 1/3
Al2  .0900 .3300 2/3
O1     1/3   2/3   0
O2   .0900 .3300  .5
O3   .1700 .5200 .75
O4   .1700 .5200 .25
O5     .25 .2800 .25
O6     .25 .2800 .75