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 = 516 C
_database_code_amcsd 0003457
8.66710 8.66710 8.8857 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0168
Be       0    .5   .25  .010
Si   .0123 .2541 .4948 .0168
O1   .1500 .1374 .4464 .0188
O2   .3436 .0340 .6517 .0188
O3   .4304 .1450 .1393 .0188
Na   .1602 .1977 .1828 .0471
Cl       0     0     0 .0585