Nepheline
Gatta G D, Angel R J
American Mineralogist 92 (2007) 1446-1455
Elastic behavior and pressure-induced structural evolution of nepheline:
Implications for the nature of the modulated superstructure
Locality: intrusive aplite of Snipe River, Tambani, Nyasaland, Malawi
Sample: P = 4.130 GPa
_database_code_amcsd 0004425
9.7178 9.7178 8.2030 90 90 120 P6_3
atom      x      y      z occ  Uiso
K         0      0  .0041 .54 .0190
NaK       0      0  .0041 .24 .0190
CaK       0      0  .0041 .03 .0190
Na   .55760 .99930  .5064     .0182
AlT1    2/3    1/3 .71222     .0087
SiT2    2/3    1/3 .31158     .0075
SiT3 .91817 .67174 .82475     .0091
AlT4 .91775 .67115 .19370     .0075
O1      2/3    1/3  .5059     .0406
O2   .00071 .69849  .0042     .0144
O3    .8336 .47374  .2310     .0207
O4    .8456 .48771  .7642     .0166
O5   .77691 .71442  .8345     .0126
O6    .7850  .7392  .1875     .0135