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Report of the Association Internationale Pour L’étude Des Argiles (AIPEA) Nomenclature Committee for 2001: Order, Disorder and Crystallinity in Phyllosilicates and the Use of the “Crystallinity Index”

Published online by Cambridge University Press:  01 January 2024

Stephen Guggenheim ,
Derek C. Bain ,
Faíza Bergaya ,
Maria F. Brigatti ,
Victor A. Drits ,
Dennis D. Eberl ,
Milton L. L. Formoso ,
Emilio Galán ,
Richard J. Merriman  and
Donald R. Peacor
...Show all authors
Stephen Guggenheim*
Affiliation:
AIPEA Nomenclature Committee, Department of Earth and Environmental Sciences, University of Illinois at Chicago, 845 W. Taylor St., Chicago, Illinois 60607, USA
Derek C. Bain
Affiliation:
Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen, AB15 8QH, UK
Faíza Bergaya
Affiliation:
Centre de Recherche de la Matière Divisée (CRMD), National Centre of Scientific Research, University of Orléans, lb Rue de la Férollerie, 45 071 Orléans Cedex 2, France
Maria F. Brigatti
Affiliation:
Department of Earth Sciences, Modena and Reggio Emilia University, Largo S. Eufemia 19, I-41100 Modena, Italy
Victor A. Drits
Affiliation:
Geological Institute of the Russian Academy of Science, 7 Pyzerskii Per, Moscow J-17 Russia
Dennis D. Eberl
Affiliation:
US Geological Survey, 3215 Marine St., Boulder, Colorado, 80303, USA
Milton L. L. Formoso
Affiliation:
9500, Ave Bento Gonçalves, Campus do Vale, Institute of Geosciences, University Federal do Rio Grande do Sul, Porto Alegre - RS - Brazil, CEP - 91540-000
Emilio Galán
Affiliation:
Department of Crystallography and Minerals, Facultad de Quimica Universite, Sevilla, Spain
Richard J. Merriman
Affiliation:
British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK
Donald R. Peacor
Affiliation:
Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
Helge Stanjek
Affiliation:
Lehrstuhl Für Bodenkunde, Technische Universtät Munchen, D-85350 Freising-Weihenstephan, Germany
Takashi Watanabe
Affiliation:
Joetsu University of Education, Joetsu Niigata 943, Japan
*
*E-mail address for correspondence: xtal@uic.edu
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The purpose of this report is to describe the appropriate use of indices relating to crystallinity, such as the ‘crystallinity index’, the ‘Hinckley index’, the ‘Kübler index’, and the ‘Árkai index’. A ‘crystalline’ solid is defined as a solid consisting of atoms, ions or molecules packed together in a periodic arrangement. A ‘crystallinity index’ is purported to be a measure of crystallinity, although there is uncertainty about what this means (see below). This report discusses briefly the nature of order, disorder and crystallinity in phyllosilicates and discusses why the use of a ‘crystallinity index’ should be avoided. If possible, it is suggested that indices be referred to using the name of the author who originally described the parameter, e.g. ‘Hinckley index’ or ‘Kübler index’, or in honor of a researcher who investigated the importance of the parameter extensively, e.g. ‘Árkai index’.

Keywords

AmorphousÁrkai IndexCrystallinityCrystallinity IndexDisorderElectron AmorphousHinckley IndexKübler IndexNear AmorphousNomenclatureOrderX-ray Amorphous
Type
Research Article
Information
Clays and Clay Minerals , Volume 50 , Issue 3 , June 2002 , pp. 406 - 409
Copyright
Copyright © 2002, The Clay Minerals Society

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