Tugtupite
Antao S M, Hassan I, Parise J B
American Mineralogist 89 (2004) 492-497
Tugtupite: High-temperature structures obtained from in situ synchrotron
diffraction and Rietveld refinements
T = 33 C
_database_code_amcsd 0003451
8.62597 8.62597 8.8564 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0125
Be       0    .5   .25  .007
Si   .0133 .2539 .4949 .0125
O1   .1501 .1367 .4433 .0111
O2   .3438 .0359 .6503 .0111
O3   .4249 .1430 .1391 .0111
Na   .1571 .1970 .1824 .0268
Cl       0     0     0 .0302