For synthetic faujasites with SiO2/Al2O3 mole ratios from 2.44 to 4.93, the unit-cell parameter, a, and the positions of certain infrared bands varied linearly with mole fraction of AlO2-. Natural faujasite from h'mburgite from the Kaiserstuhl in southwestern Germany was near the high-silica end member of the series, although the lattice constant and one of the infrared bands deviated slightly from the linear relationship of the synthetics. This deviation can be explained by the likely presence of a small amount of amorphous silica in the synthetic samples. A uniform nomenclature is proposed, for example faujasite, sodium (2.44), which identifies the structure, exchange cation and position in the SiO2/Al2O3 stability range.

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