High- and low-silica faujasites; a substitutional series

For synthetic faujasites with SiO2/Al2O3 mole ratios from 2.44 to 4.93, the unit-cell parameter, #ITa#ME, and the positions of certain infrared bands varied linearly with mole fraction of AlO2-. Natural faujasite from limburgite from the Kaiserstuhl in southwestern Germany was near the high-silica e...

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Bibliographic Details
Published inThe American mineralogist Vol. 53; no. 7-8; pp. 1293 - 1303
Main Authors Wright, Alan C, Rupert, J. Paul, Granquist, W. T
Format Journal Article
LanguageEnglish
Published Mineralogical Society of America 01.08.1968
Subjects
Compositional variation
faujasite
framework silicates
High and low silica faujasite
mineral data
mineralogy
nomenclature
silicates
zeolite group
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Summary:For synthetic faujasites with SiO2/Al2O3 mole ratios from 2.44 to 4.93, the unit-cell parameter, #ITa#ME, and the positions of certain infrared bands varied linearly with mole fraction of AlO2-. Natural faujasite from limburgite 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.
ISSN:0003-004X
1945-3027