Omphacite
Matsumoto T, Tokonami M, Morimoto N
American Mineralogist 60 (1975) 634-641
The crystal structure of omphacite
_database_code_amcsd 0000466
9.585 8.776 5.260 90 106.8 90 P2/n
atom     x     y     z  occ Biso
Si1  .5393 .3465 .2273       .37
Si2  .5376 .1621 .7310       .36
Al1    .25 .3480   .75 .868  .32
Fe1    .25 .3480   .75 .132  .32
Mg2    .25 .1580   .25 .815  .43
Fe2    .25 .1580   .25 .185  .43
Ca3    .25 .5521   .25 .314  .86
Na3    .25 .5521   .25 .686  .86
Ca4    .25 .9502   .75 .716  .82
Na4    .25 .9502   .75 .284  .82
O1   .3634 .3382 .1232       .73
O2   .3621 .1767 .6475       .74
O3   .6138 .5090 .3091       .76
O4   .6063 .9974 .8054       .80
O5   .6057 .2663 .0037       .65
O6   .5981 .2398 .4984       .70