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A New Ni-Rich Stevensite From the Ophiolite Complex of Othrys, Central Greece

Published online by Cambridge University Press:  01 January 2024

George E. Christidis  and
Ioannis Mitsis
George E. Christidis*
Affiliation:
Technical University of Crete, Department of Mineral Resources Engineering, 73100, Chania, Greece
Ioannis Mitsis
Affiliation:
Section of Geochemistry and Economic Geology, Department of Geology, University of Athens, Panepistimioupolis, Ano Ilisia 15784, Greece
*
*E-mail address of corresponding author: christid@mred.tuc.gr
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Abstract

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The first occurrence of Ni-rich stevensite found in the ophiolite complex of Othrys, Central Greece is described. The stevensite, which develops in cracks in a host serpentinite, formed at the expense of serpentine. Two varieties of stevensite have been described: a Mg-rich, Ni-poorer variety with 0.4–1.2 octahedral Ni atoms per half formula unit (p.h.f.u.) and a Ni-rich variety with >2 Ni atoms p.h.f.u. The layer charge in both varieties is −0.24 p.h.f.u.. Stevensite layers are completely separated when dispersed in dilute polyvinylpyrrolidone (PVP) solutions and begin to convert to talc after heating at 250°C for 90 min. Total conversion to talc is observed at 550°C. Formation of Ni-rich stevensite took place at ambient temperature during supergene processes. The scarcity of Ni-rich stevensite occurrences in nature is attributed to the metastability of smectite and to the analytical procedures used in previous studies. Stevensite is considered a phase containing domains with variable numbers of octahedral vacancies. A new experimental protocol is proposed for the determination of Ni-rich stevensite, based on a combination of XRD after solvation with various organic liquids and subsequent heating at 750°C.

Keywords

GreeceMetastabilityNi-rich StevensiteOctahedral VacancyOthrys Ophiolite ComplexPVPSerpentineSupergene AlterationTalcXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 54 , Issue 6 , December 2006 , pp. 653 - 666
Copyright
Copyright © 2006, The Clay Minerals Society

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