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 = 419 C
_database_code_amcsd 0003456
8.65669 8.65669 8.8778 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0160
Be       0    .5   .25  .009
Si   .0124 .2541 .4949 .0160
O1   .1501 .1372 .4454 .0172
O2   .3436 .0343 .6515 .0172
O3   .4291 .1447 .1392 .0172
Na   .1595 .1976 .1827 .0424
Cl       0     0     0 .0516