Elpidite
Cannillo E, Rossi G, Ungaretti L
American Mineralogist 58 (1973) 106-109
The crystal structure of elpidite
_database_code_amcsd 0000303
7.14 14.68 14.65 90 90 90 Pbcm
atom      x     y     z Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3)
Zr    .4950   .25    .5       .0029  .0002  .0005      0      0 -.0001
Si1   .7720 .3854 .6462  .40
Si2   .5086 .0476 .6413  .51
Si3   .2170 .3928 .6435  .49
Na1   .4362 .2299   .75 2.07
Na2  -.0027   .25    .5 2.02
O1    .9966 .4047 .6392 1.46
O2    .7156 .3538   .75 1.33
O3    .7077 .3099 .5772 1.38
O4    .6781 .4825 .6277 1.53
O5    .5285 .0713   .75  .93
O6    .4904 .1405 .5886 1.20
O7    .3029 .4888 .6119  .51
O8    .2881 .3770   .75  .79
O9    .2928 .3097 .5823  .80
Wat1  .0104 .1130 .5810 2.61
Wat2  .1233 .1895   .75 3.04