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Structural, chemical and spectroscopic re-examination of type uklonskovite leads to its redefinition

Published online by Cambridge University Press:  26 January 2018

S. Menchetti ,
L. Bindi ,
D. Belakovskiy  and
F. Zaccarini
S. Menchetti*
Affiliation:
Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, I-50121 Firenze, Italy
L. Bindi
Affiliation:
Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, I-50121 Firenze, Italy C.N.R. Istituto di Geoscienze e Georisorse, sezione di Firenze, Via La Pira 4, I-50121 Firenze, Italy
D. Belakovskiy
Affiliation:
Fersman Mineralogical Museum, Leninskiy prospect 18, Moscow, 117071 Russia
F. Zaccarini
Affiliation:
Department Angewandte Geowissenshcaften und Geophysik, Montan Universität, Peter Tunner Str. 5, A8700 Leoben, Austria
*
* E-mail: silvio.menchetti@unifi.it
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Abstract

The crystal structure and the chemical composition of uklonskovite from the holotype material was reinvestigated to shed light on its correct chemical formula. On the basis of information gained from this characterization, we revised the formula from NaMg(SO4)OH·2H2O to NaMg(SO4)F·2H2O (F instead of OH). A careful analysis of the structural details together with a critical review of all the chemical data listed in the scientific literature for uklonskovite support our redefinition. We also present Raman data for the mineral for the first time. Our proposal was approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (voting proposal 16-J).

Keywords

uklonskovitecrystal structurechemical compositionRaman spectroscopychemical formulaCetineItaly
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 6 , December 2017 , pp. 1397 - 1404
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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