Hydrous sodium silicate, synthesis from aqueous suspensions containing SiO 2 and NaOH with SiO 2 /NaOH ratios ranging from 5 to 20 and H 2 O/NaOH ratios from 50 to 500 at 100-150 degrees C. Transformation: magadiite --> kenyaite --> quartz. Formation of kenyaite at 100 degrees C requires several months; reaction times decreased at higher temperatures but quartz forms rapidly. Synthetic kenyaites form spherical aggregates of well-developed plates. Intracrystalline reactivity. Through exchange of protons for the interlayer sodium ions, kenyaite is transformed into a crystalline silicic acid.--Modified journal abstract.

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