Nepheline
Simmons W B, Peacor D R
American Mineralogist 57 (1972) 1711-1719
Refinement of the crystal structure of a volcanic nepheline
_database_code_amcsd 0000296
10.003 10.003 8.381 90 90 120 P6_3
atom     x     y     z  occ B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3)
Na   .9972 .4432 .9913       .0082  .0050  .0054  .0032  .0004  .0003
K        0     0 .9893       .0102  .0102  .0097  .0051      0      0
Al1  .3333 .6667 .1877  .51  .0036  .0036  .0035  .0018      0      0
Si1  .3333 .6667 .1877  .49  .0036  .0036  .0035  .0018      0      0
Si2  .3333 .6667 .7990  .58  .0060  .0060  .0040  .0030      0      0
Al2  .3333 .6667 .7990  .42  .0060  .0060  .0040  .0030      0      0
Si3  .0933 .3344 .3090  .84  .0021  .0023  .0044  .0009 -.0009 -.0003
Al3  .0933 .3344 .3090  .16  .0021  .0023  .0044  .0009 -.0009 -.0003
Al4  .0934 .3318 .6824  .73  .0027  .0033  .0027  .0016 -.0012 -.0005
Si4  .0934 .3318 .6824  .27  .0027  .0033  .0027  .0016 -.0012 -.0005
O1   .3327 .7024 .9846 .333  .0113  .0079  .0105  .0081 -.0083 -.0068
O2   .0269 .3168 .4921       .0062  .0120  .0044  .0061 -.0021 -.0018
O3   .1713 .5235 .7210       .0066  .0057  .0183  .0035  .0001  .0022
O4   .1647 .5108 .2393       .0022  .0022  .0103  .0005 -.0004  .0016
O5   .2258 .2873 .3099       .0037  .0069  .0029  .0038 -.0005  .0000
O6   .2229 .2657 .6892       .0063  .0044  .0082  .0038 -.0011  .0003