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Amorphous and partly ordered structures in SiO (sub 2) rich volcanic glasses; an ED study

Viktoria Kovacs Kis, Istvan Dodony and Janos L. Labar
Amorphous and partly ordered structures in SiO (sub 2) rich volcanic glasses; an ED study
European Journal of Mineralogy (December 2006) 18 (6): 745-752

Abstract

The glass structures of samples of obsidian and pumice were measured using electron diffraction. Amorphous, partly ordered and nanocrystalline regions were distinguiushed and analysed separately. The deconvoluted atomic distances obtained from experimental diffraction patterns through pair-distribution functions are consistent with distances for ideal SiO (sub 2) tetrahedra. Partly ordered structures in pumices are composed of plate-like fragments of tridymite/cristobalite layers, whereas obsidian contains quartz nanocrystals with abundant moganite-like planar faults. The validity of an earlier structure model for silica glasses is discussed and an alternative interpretation is suggested for silicic volcanic glasses.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 18
Serial Issue: 6
Title: Amorphous and partly ordered structures in SiO (sub 2) rich volcanic glasses; an ED study
Affiliation: Research Institute for Technical Physics and Materials Science, Budapest, Hungary
Pages: 745-752
Published: 200612
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 33
Accession Number: 2007-017127
Categories: Mineralogy of silicatesIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Eotvos Lorand University, HUN, Hungary
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200710
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