| http://www.w3.org/ns/prov#value | - Suitable for the present purposes are those having empirical formula: [Mz(AlO2)z(SiO2)v].xH2O wherein z and v are integers of at least 6, M is an alkali metal, preferably Na and/or K, the molar ratio of z to v is in the range from 1.0 to 0.5, and x is an integer from 15 to 264.
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