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 = 20 C, data from Hassan and Grundy (1991)
_database_code_amcsd 0003450
8.640 8.640 8.873 90 90 90 I-4
atom     x     y     z  Uiso
Al       0    .5   .75 .0075
Be       0    .5   .25 .0098
Si   .0127 .2533 .4958 .0075
O1   .1504 .1343 .4417 .0121
O2   .3472 .0385 .6488 .0121
O3   .4256 .1486 .1377 .0121
Na   .1563 .1972 .1818 .0188
Cl       0     0     0 .0234