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GEOREF RECORD

Hydrothermal conversion of trachytic glass to zeolite; 3, Monocationic model glasses

Maurizio de Gennaro, Alessio Langella, Piergiulio Cappelletti and Carmine Colella
Hydrothermal conversion of trachytic glass to zeolite; 3, Monocationic model glasses
Clays and Clay Minerals (June 1999) 47 (3): 348-357

Abstract

Experiments on zeolitization were conducted on four synthetic monocationic glasses (Na, K, Ca, or Mg-rich glass) with Si/Al molar ratios of 2.67, similar in acidity to many volcanic glasses of partially zeolitized Italian tuffs. The products of the hydrothermal treatment at 100, 150, and 200 degrees C of single glasses or glass mixtures with deionized H (sub 2) O or monosaline solutions (NaCl, KCl, CaCl (sub 2) ) were characterized by X-ray diffraction, thermal, microscopic and chemical analyses. Chemical analyses of mother liquors were also performed. Mineral assemblages, containing chabazite, phillipsite, analcime, and K-feldspar, very similar to those found in altered, volcaniclastic alkali-trachytic or trachytic glass deposits were produced. Potassium was essential to chabazite and phillipsite crystallization, although phillipsite was obtained also in Ca-Na mixed systems. Sodium was necessary for analcime formation. Calcium plays only a secondary role in zeolitization, and magnesium does not favor zeolite crystallization but promotes the formation of smectite. Glass composition determines the mineral assemblages obtained and hence in those commonly found in nature.


ISSN: 0009-8604
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 47
Serial Issue: 3
Title: Hydrothermal conversion of trachytic glass to zeolite; 3, Monocationic model glasses
Affiliation: Universita Federico II, Dipartimento di Scienze della Terra, Naples, Italy
Pages: 348-357
Published: 199906
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 27
Accession Number: 1999-062819
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Universita del Sannio, ITA, Italy
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199921
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