Tridymite
Graetsch H
Physics and Chemistry of Minerals 28 (2001) 313-321
X-ray powder diffraction study on the modulated high temperature forms
of SiO2 tridymite between 110 and 220 C
Sample: superstructure, T = 115 C
Locality: synthetic
_database_code_amcsd 0008553
26.1753 4.98437 8.2006 90 90 90 P2_12_12_1
atom     x     y     z  Uiso
Si1  .1389  .511 .6949 .0373
Si2  .1400  .391 .3292 .0373
Si3  .1944  .888 .1993 .0373
Si4  .1948  .019 .8302 .0373
Si5  .0287  .395 .1867 .0373
Si6  .0283  .510 .8158 .0373
O1   .1966 -.043 .0153 .0602
O2   .1491  .457 .5103 .0602
O3   .0823  .429 .2778 .0602
O4   .0814  .568 .7299 .0602
O5   .2502  .080 .7704 .0602
O6   .1571  .260 .8002 .0602
O7   .1757  .583 .2262 .0602
O8   .1570  .087 .2902 .0602
O9   .1729  .766 .7330 .0602
O10  .4634  .541 .5021 .0602
O11  .4906  .905 .7234 .0602
O12  .4960  .726 .2124 .0602