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 = 902 C
_database_code_amcsd 0003464
8.70633 8.70633 8.9169 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0208
Be       0    .5   .25  .015
Si   .0116 .2541 .4949 .0208
O1   .1494 .1387 .4505 .0272
O2   .3433 .0315 .6528 .0272
O3   .4355 .1460 .1400 .0272
Na   .1631 .1985 .1834 .0674
Cl       0     0     0 .0899