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Report of the Association Internationale pour l'Etude 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:  09 July 2018

S. Guggenheim ,
D. C. Bain ,
F. Bergaya ,
M. F. Brigatti ,
V. A. Drits ,
D. D. Eberl ,
M. L. L. Formoso ,
E. Galán ,
R. J . Merriman  and
D. R. Peacor
...Show all authors
S. Guggenheim*
Affiliation:
AIPEA Nomenclature Committee, Department of Earth and Environmental Sciences, Universityof Illinois at Chicago, 845 W. Taylor St., ChicagoIllinois 60607, USA
D. C. Bain
Affiliation:
Macaulay Land Use Research Institute, CraigiebucklerAberdeen AB15 8QH, UK
F. Bergaya
Affiliation:
Centre de Recherche de la Matière Divisée (CRMD), National Centre of Scientific Research, University of Orléans, 1b Rue de la Férollerie, 45 071 Orléans Cedex 2, France
M. F. Brigatti
Affiliation:
Department of Earth Sciences, Modena and Reggio Emilia University, Largo S. Eufemia 19, I-41100, ModenaItaly
V. A. Drits
Affiliation:
Geological Institute of the Russian Academy of Science, 7 Pyzerskii Per, Moscow J-17, Russia
D. D. Eberl
Affiliation:
US Geological Survey, 3215 Marine St., BoulderColorado 80303, USA
M. 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
E. Galán
Affiliation:
Department of Crystallography and Minerals, Facultad de Quimica Universite, SevillaSpain
R. J . Merriman
Affiliation:
British Geological Survey, KeyworthNottingham NG12 5GG, UK
D. R. Peacor
Affiliation:
Department of Geological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
H. Stanjek
Affiliation:
Lehrstuhl für Bodenkunde, Technische Universtät Munchen, D-85350 Freising-Weihenstephan, Germany
T. Watanabe
Affiliation:
Joetsu University of Education, Joetsu Niigata 943, Japan
*
*E-mail: xtal@uic.edu
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Abstract

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 ‘Kü bler 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, as in ‘Hinckley index’ or ‘Kübler index’, or in honour of a researcher who investigated the importance of the parameter extensively, as in ‘Árkai index’.

Keywords

amorphousÁrkai indexcrystallinityCrystallinity Indexdisorderelectron amorphousHinckley indexKübler indexnear amorphousnomenclatureorderX-ray amorphous
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 2 , June 2002 , pp. 389 - 393
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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