Tridymite
Lee S, Xu H
Acta Crystallographica B75 (2019) https://doi.org/10.1107/S2052520619000933
Using powder XRD and pair distribution function to determine anisotropic
atomic displacement parameters of orthorhombic tridymite and
tetragonal cristobalite
Locality: rhyolitic rock, New Mexico, USA
_database_code_amcsd 0020744
8.7549 5.0335 8.2118 90 90 90 C222_1
atom     x     y     z  Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Si   .1672 .5459 .1877 .0293   .033   .031   .024   .003   .004   .007
O1   .3315     0    .5 .0390   .049   .043   .025      0      0   .003
O2       0 .5587   .25 .0277   .022   .026   .035      0   .006      0
O3   .2522 .3139 .2729 .0187   .019   .015   .022   .002  -.006   .001