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 = 306 C
_database_code_amcsd 0003455
8.64804 8.64804 8.8715 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0153
Be       0    .5   .25  .009
Si   .0127 .2541 .4948 .0153
O1   .1500 .1372 .4445 .0157
O2   .3434 .0343 .6512 .0157
O3   .4277 .1442 .1391 .0157
Na   .1589 .1972 .1827 .0385
Cl       0     0     0 .0458