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Origin of twist in "gwindel" quartz crystals from the Alps; a transmission electron microscopy study

Patrick Cordier and Florian Heidelbach
Origin of twist in "gwindel" quartz crystals from the Alps; a transmission electron microscopy study
European Journal of Mineralogy (February 2013) 25 (2): 145-153

Abstract

Two twisted quartz crystals (gwindels) from the Alps were studied by transmission electron microscopy and large-angle convergent-beam electron diffraction (LACBED) to elucidate the twist mechanism. We found that torsion results from a distribution of straight screw geometrically necessary b=1/3(2110) dislocations with a dislocation density of the order of 10 (super 10) m (super -2) . This dislocation microstructure induces an Eshelby twist which can account for the observed twist of a few degrees per centimetre. This microstructure suggests that twisted gwindel quartz forms by the spiral growth mechanism which enables crystal growth under small driving forces.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 25
Serial Issue: 2
Title: Origin of twist in "gwindel" quartz crystals from the Alps; a transmission electron microscopy study
Affiliation: Universite Lille 1, Unite Materiaux et Transformations, Villeneuve d'Ascq, France
Pages: 145-153
Published: 201302
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 39
Accession Number: 2013-046194
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
N45°45'00" - N46°04'60", E06°49'60" - E07°04'60"
Secondary Affiliation: Universitaet Bayreuth, DEU, Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201329
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