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Experimental constraints on illite crystal morphology

Published online by Cambridge University Press:  09 July 2018

A. Bauer ,
B. Velde  and
R. Gaupp
A. Bauer*
Affiliation:
Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgungstechnik, PO Box 3640, D-76021 Karlsruhe, Germany
B. Velde
Affiliation:
Laboratoire de Géologie, CNRS URA 1316, Ecole Normale Supérieure, 24 rue Lhomond, F-75231 Paris, France
R. Gaupp
Affiliation:
Universität Jena, Institut für Geowissenschaften, Burgweg 11, D-07749 Jena, Germany
*
*E-mail: [email protected]
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Abstract

Observations of natural minerals and experimental run products show that I-S (illitesmectite mixed-layer minerals) with a high illite content as well as pure mica-illite crystallites can have a lath shape (aspect ratio >3). This shape is common to the I-S minerals under a variety of conditions of formation. The experiments presented indicate that the occurrence of lath-shaped micaillite is due to a slow growth rate from supersaturated solutions. This lath-shaped crystallite is metastable as the ultimate stable shape is hexagonal. A longer period of crystal growth will replace the mica-illite laths with crystallites of a hexagonal form. Thus the presence of lath-shaped micaillite indicates the existence of a metastable crystal form for this mineral.

Keywords

illite morphologycrystal growthlath-shaped mica
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 3 , June 2000 , pp. 587 - 597
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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