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 = 113 C
_database_code_amcsd 0003453
8.63144 8.63144 8.8598 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0135
Be       0    .5   .25  .005
Si   .0131 .2540 .4949 .0135
O1   .1502 .1366 .4433 .0120
O2   .3436 .0352 .6506 .0120
O3   .4257 .1439 .1390 .0120
Na   .1577 .1969 .1824 .0301
Cl       0     0     0 .0344