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 = 596 C
_database_code_amcsd 0003458
8.67339 8.67339 8.8904 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0175
Be       0    .5   .25  .013
Si   .0122 .2544 .4946 .0175
O1   .1501 .1384 .4467 .0208
O2   .3427 .0329 .6520 .0208
O3   .4310 .1444 .1396 .0208
Na   .1606 .1974 .1830 .0518
Cl       0     0     0 .0638