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A sodium ilerite, molar ratios 1Na 2 O:8.2SiO 2 :10.2H 2 O, was obtained with a good crystalline structure and characterized by several NMR techniques in addition to X-ray diffraction (XRD). The X-ray pattern of the as-synthesized ilerite is in very good agreement with the structure proposed by Gies and coworkers. The narrow 29 Si MAS NMR signals (FWHM=0.3 ppm)...