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 = 982 C
_database_code_amcsd 0003466
8.71853 8.71853 8.9269 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0218
Be       0    .5   .25  .015
Si   .0115 .2540 .4949 .0218
O1   .1491 .1393 .4518 .0297
O2   .3432 .0308 .6529 .0297
O3   .4373 .1462 .1400 .0297
Na   .1640 .1988 .1837 .0737
Cl       0     0     0 .1002