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
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