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Figure 2 . Drawings of the structure featuring alternate stacking of the dreier and sechser ring layers. The Si1—Si10 tetrahedra in the dreier ring layer are colored in dark blue, while the edge-sharing Si(Al)11-14 and Si(Al)l15-18 tetrahedra in the sechser ring layer are colored in pale blue and green, respectively. Sr (red) are located in the larger channels formed in the Si—Al—O—N skeleton. |