Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula
AbstractAt 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
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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.
Panikorovskii TL, Chukanov NV, Rusakov VS, Shilovskikh VV, Mazur AS, Balassone G, Ivanyuk GY, Krivovichev SV. Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula. Minerals. 2017; 7(12):248.Chicago/Turabian Style
Panikorovskii, Taras L.; Chukanov, Nikita V.; Rusakov, Vyacheslav S.; Shilovskikh, Vladimir V.; Mazur, Anton S.; Balassone, Giuseppina; Ivanyuk, Gregory Y.; Krivovichev, Sergey V. 2017. "Vesuvianite from the Somma-Vesuvius Complex: New Data and Revised Formula." Minerals 7, no. 12: 248.
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