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Nomenclature of amphiboles: additions and revisions to the International Mineralogical Association’s amphibole nomenclature

¹ School of Earth, Ocean and Planetary Sciences, Cardiff University, P.O. Box 914, Cardiff CF10 3YE, UK
² Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
³ Department of Mineralogy and Petrology, Museum of Victoria, 328 Swanston Street, Melbourne, Victoria 3000, Australia
⁴ Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
⁵ Dipartimento di Scienze Mineralogie e Petrologie, Via Valpergo Caluso 35, I-10125 Torino, Italy
⁶ Mineral Sciences Division, Canadian Museum of Nature, P.O. Box 3443, Station D, Ottawa, Ontario K1 6P4, Canada
⁷ Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
⁸ Department of Geology and Mineralogy, Ben Gurion University of the Negev, Beer Sheva 84105, P.O. Box 653, Israel
⁹ Faculty of Geology, St Petersburg University, Universitetskaia Naberezhnaia 7/9, 199034, St Petersburg, Russia
¹⁰ Department of Earth Sciences, Wills Memorial Building, University of Bristol, Bristol BS8 1RJ, UK
¹¹ Earth Sciences, University of New England, Armidale, NSW 2351, Australia
¹² 60 Exeter Road, Kidlington, Oxford OX5 2DZ, UK

^* E-mail: LeakeB{at}cardiff.ac.uk

The introduction of a fifth amphibole group, the Na-Ca-Mg-Fe-Mn-Li group, defined by 0.50 < ^B(Mg,Fe²⁺,Mn²⁺,Li) < 1.50 and 0.50 ^B(Ca,Na) 1.50 a.f.p.u. (atoms per formula unit), with members whittakerite and ottoliniite, has been required by recent discoveries of ^B(LiNa) amphiboles. This, and other new discoveries, such as sodicpedrizite (which, here, is changed slightly, but significantly, from the original idealized formula), necessitate amendments to the IMA 1997 definitions of the Mg-Fe-Mn-Li, calcic, sodic-calcic and sodic groups. The discovery of obertiite and the finding of an incompatibility in the IMA 1997 subdivision of the sodic group, requires further amendments within the sodic group. All these changes, which have IMA approval, are summarized.

KEYWORDS: amphibole nomenclature, sodicpedrizite, whittakerite, ottoliniite, sodic amphiboles, obertiite

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