Nomenclature of the Micas

M. Rieder, G. Cavazzini, Yu. S. D'Yakonov, P. V. Koval', G. Müller, A. M. R. Neiva, F. P. Sassi, H. Takeda, Z. Weiss, V. A. Frank-Kamenetskii, G. Gottardi, S. Guggenheim, E. W. Radoslovich, J.-L. Robert and D. R. Wones
Department of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 12843 Praha 2, Czech Republic
Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi, 37, I-35122 Padova, Italy
VSEGEI, Srednii pr., 74, 199 026 Sankt-Peterburg, Russia
Institut geokhimii SO AN Rossii, ul. Favorskogo 1a, Irkutsk - 33, Russia 664 033
Institut für Mineralogie und Mineralische Rohstoffe, Technische Universität Clausthal, Postfach 1253, D-38670 Clausthal-Zellerfeld, Germany
Departamento de Ciências da Terra, Universidade de Coimbra, Apartado 3014, 3049 Coimbra CODEX, Portugal
Dipartimento di Mineralogia e Petrologia, Università di Padova, Corso Garibaldi, 37, I-35122 Padova, Italy
Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino City, Chiba 275, Japan
Central Analytical Laboratory, Technical University of Mining and Metallurgy, Tř. 17. listopadu, 708 33 Ostrava-Poruba, Czech Republic
Department of Geological Sciences, University of Illinois at Chicago, 845 West Taylor St., Chicago, IL 60607-7059, USA
Centre de Recherche sur la Synthèse et la Chimie des Minéraux, C.N.R.S., 1A, Rue de la Férollerie, 45071 Orléans CEDEX 2, France
ΔAustralia; resigned 1986

Abstract: End-members and species defined with permissible ranges of composition are presented for the true micas, the brittle micas, and the interlayer-deficient micas. The determination of the crystallochemical formula for different available chemical data is outlined, and a system of modifiers and suffixes is given to allow the expression of unusual chemical substitutions or polytypic stacking arrangements. Tables of mica synonyms, varieties, ill-defined materials, and a list of names formerly or erroneously used for micas are presented. The Mica Subcommittee was appointed by the Commission on New Minerals and Mineral Names of the International Mineralogical Association. The definitions and recommendations presented were approved by the Commission.

Keywords: mica • nomenclature

Mineralogical Magazine; April 1999 v. 63; no. 2; p. 267-279; DOI: 10.1180/002646199548385
© 1999, The Mineralogical Society
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