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Minerals 2017, 7(12), 248; https://doi.org/10.3390/min7120248

Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula

1
Department of Crystallography, Institute of Earth Sciences, St. Petersburg State University, University Embankment, 7/9, St. Petersburg 199034, Russia
2
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia
3
Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka 142432, Russia
4
Faculty of Physics, Moscow State University, Vorobievy Gory, Moscow 119991, Russia
5
Department of Colloid Chemistry, Insitute of Chemistry, St. Petersburg State University, University Av. 26, St. Petersburg 198504, Russia
6
Center for Magnetic Resonance, St. Petersburg State University, University Av. 26, St. Petersburg 198504, Russia
7
Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Università degli Studi di Napoli Federico II, Compless Universitario Monte S. Angelo, Via Cinthia 26, 80126 Napoli, Italy
*
Author to whom correspondence should be addressed.
Received: 2 December 2017 / Revised: 12 December 2017 / Accepted: 14 December 2017 / Published: 16 December 2017
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Abstract

At present, the vesuvianite group of minerals consists of eight members, six of which are distinguished by the dominant cation in the Y1(A,B) five-coordinated site. We investigated two vesuvianite samples from the type locality by electron microprobe analysis, Mössbauer and infrared spectroscopy, TGA/DSC, MAS NMR, single-crystal and powder X-ray diffraction. The crystal structures of these samples (# 27844 and 51062 from the Vesuvius collection, Fersman Mineralogical Museum, Moscow) have been refined to R1 = 0.027 and R1 = 0.035, respectively. Both samples have the space group P4/nnc; a = 15.5720(3) and 15.5459(3), c = 11.8158(5) and 11.7988(4), respectively. In both samples low-occupied T1 and T2 sites are populated by minor B and Al, which agrees with their high-temperature origin. According to our experimental results, the general revised crystal-chemical formula of vesuvianite can be written as VII−IXX19VY1VIY12(Z2O7)4(ZO4)10(W)10, where X are seven- to nine-coordinated sites of Ca with minor Na, K, Fe2+ and REE impurities; VY has a square pyramidal coordination and is occupied predominantly by Fe3+ with subordinate Mg, Al, Fe2+ and Cu2+; VIY has octahedral coordination and is predominantly occupied by Al with subordinate Mg, Fe2+, Fe3+, Mn2+, Mn3+, Ti, Cr and Zn; ZO4 = SiO4, sometimes with subordinate AlO4 and/or (OH)4, and W = OH, F, with minor O and Cl. The idealized charge-balanced formula of the vesuvianite end-member without subordinate cations is Ca19Fe3+(Al10Me2+2)(Si2O7)4(SiO4)10O(OH)9, where Ме = Fe2+, Mg2+, Mn2+. View Full-Text
Keywords: vesuvianite-group minerals; Somma-Vesuvius volcanic complex; vesuvianite; nomenclature; crystal structure vesuvianite-group minerals; Somma-Vesuvius volcanic complex; vesuvianite; nomenclature; crystal structure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Panikorovskii, T.L.; Chukanov, N.V.; Rusakov, V.S.; Shilovskikh, V.V.; Mazur, A.S.; Balassone, G.; Ivanyuk, G.Y.; Krivovichev, S.V. Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula. Minerals 2017, 7, 248.

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