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 = 709 C
_database_code_amcsd 0003460
8.68613 8.68613 8.9006 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0187
Be       0    .5   .25  .013
Si   .0119 .2541 .4949 .0187
O1   .1496 .1380 .4483 .0228
O2   .3433 .0325 .6522 .0228
O3   .4327 .1456 .1396 .0228
Na   .1618 .1978 .1831 .0571
Cl       0     0     0 .0731