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 = 934 C
_database_code_amcsd 0003465
8.71168 8.71168 8.9214 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0210
Be       0    .5   .25  .015
Si   .0117 .2540 .4949 .0210
O1   .1492 .1389 .4511 .0282
O2   .3432 .0313 .6527 .0282
O3   .4363 .1462 .1401 .0282
Na   .1634 .1986 .1836 .0698
Cl       0     0     0 .0940