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The structures of 62 TgO12 units from zeolite A crystal structures and of 16 molecular analogs from RgSig012 crystal structures have been analyzed for deformations from mgm (Oh) symmetry using principal component analysis. Overall, about 95% of the deformations correspond to those expected from a model of rigid tetrahedra joined flexibly across comer-sharing oxygen atoms. The six symmetry deformation coordinates found to be important in the analysis of static distortions are the same as the coordinates associated with the six lowest vibrational frequencies of HgSig012.

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