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Experimental constraints on illite crystal morphology

¹ Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgungstechnik, PO Box 3640, D-76021 Karlsruhe, Germany, ² Laboratoire de Géologie, CNRS URA 1316, Ecole Normale Supérieure, 24 rue Lhomond, F-75231 Paris, France, and ³ Universität Jena, Institut für Geowissenschaften, Burgweg 11, D-07749 Jena, Germany

^* E-mail: bauer{at}ine.fzk.de

(Received 18 June 1999; revised 1 October 1999)

Observations of natural minerals and experimental run products show that I-S (illite-smectite 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 mica-illite 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 mica-illite indicates the existence of a metastable crystal form for this mineral.

KEYWORDS: illite morphology, crystal growth, lath-shaped mica

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