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 = 210 C
_database_code_amcsd 0003454
8.63812 8.63812 8.8644 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0143
Be       0    .5   .25  .007
Si   .0129 .2541 .4948 .0143
O1   .1502 .1368 .4437 .0134
O2   .3433 .0348 .6507 .0134
O3   .4266 .1439 .1391 .0134
Na   .1582 .1969 .1826 .0336
Cl       0     0     0 .0389