The sodium silicate kanemite (idealized: NaHSi2O5 · 3H2O) is shown to have a layer structure probably built up by “Zweiereinfachschichten.” The interlayer water can be reversibly removed, and the sodium ions can be exchanged by organic cations and by protons. The innercrystalline reactivity reveals relations to other sodium silicates. Kanemite can be synthesized from NaOH-SiO2 mixtures or sodium silicate solutions or obtained by alteration of sodium silicates such as Na2Si2O5, makatite (Na2Si4O9 · 5H20), and magadiite (Na2Si14O29 · 11H20).

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First page of Kanemite; innercrystalline reactivity and relations to other sodium silicates
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