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Mineral nomenclature: zirconolite

Published online by Cambridge University Press:  05 July 2018

Peter Bayliss
Affiliation:
Department of Geology and Geophysics, The University of Calgary, Alberta, Canada T2N 1N4
Fiorenzo Mazzi
Affiliation:
Dipartimento di Scienze della Terra—Sezione di Mineralogia, Petrografia e Geochimica—Via A. Bassi, 4—Pavia, Italy
Rosalba Munno
Affiliation:
Dipartimento di Geofisica e Vulcanologia—Largo San Marcellino, 10—Naples, Italy
Tim J. White
Affiliation:
University of Melbourne, School of Physics, Parkville, Victoria, Australia 3052

Abstract

The nomenclature of CaZrTi2O7 minerals has become very confused, such that zirconolite, zirkelite and polymignite each have acquired multiple meanings and represent five different crystal structures. To resolve these inconsistencies, the IMA approved resolutions as follows. Zirconolite is the non- crystalline (metamict) mineral or mineral with undetermined polytypoid of CaZrTi2O7. Zirconolite-3O is the three-layered orthorhombic polytypoid of CaZrTi2O7. Zirconolite-3T is the three-layered trigonal polytypoid of CaZrTi2O7. Zirconolite-2M is the two-layered monoclinic polytypoid of CaZrTi2O7. Polymignite (metamict) is discarded as equivalent to zirconolite. Zirkelite is the cubic mineral with formula (Ti,Ca,Zr)O2−x .

Information

Type
Non-silicate Mineralogy
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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