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Enricofrancoite, KNaCaSi4O10, a new Ca–K–Na silicate from Somma–Vesuvius volcano, southern Italy

Published online by Cambridge University Press:  26 February 2024

Giuseppina Balassone ,
Taras L. Panikorovskii Open the ORCID record for Taras L. Panikorovskii [Opens in a new window] ,
Annamaria Pellino ,
Ayya V. Bazai ,
Vladimir N. Bocharov ,
Olga F. Goychuk ,
Evgenia Yu. Avdontseva ,
Victor N. Yakovenchuk ,
Sergey V. Krivovichev  and
Carmela Petti
...Show all authors
Giuseppina Balassone
Affiliation:
Department of Earth Science, Environment and Resources (DiSTAR), University of Naples Federico II, Via Cintia, 26, Naples I-80126, Italy Center for Research on Archaeometry and Conservation Science (CRACS), University of Naples Federico II, Via Cintia, 26, Naples I-80126, University of Sannio, Via dei Mulini 73, Benevento I-82100, Italy National Institute of Geophysics and Volcanology (INGV), Vesuvius Observatory, Via Diocleziano I-80124 Naples, Italy
Taras L. Panikorovskii*
Affiliation:
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia Department of Crystallography, St. Petersburg State University, 7–9 Universitetskaya Naberezhnaya, St. Petersburg 199034, Russia
Annamaria Pellino
Affiliation:
Department of Earth Science, Environment and Resources (DiSTAR), University of Naples Federico II, Via Cintia, 26, Naples I-80126, Italy
Ayya V. Bazai
Affiliation:
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia
Vladimir N. Bocharov
Affiliation:
Geo Environmental Centre “Geomodel”, Saint-Petersburg State University, 1 Ul'yanovskay Str., St. Petersburg 198504, Russia
Olga F. Goychuk
Affiliation:
Kola Science Centre, Russian Academy of Sciences, 14 Fersman Street, Apatity 184200, Russia
Evgenia Yu. Avdontseva
Affiliation:
Department of Crystallography, St. Petersburg State University, 7–9 Universitetskaya Naberezhnaya, St. Petersburg 199034, Russia
Victor N. Yakovenchuk
Affiliation:
Department of Crystallography, St. Petersburg State University, 7–9 Universitetskaya Naberezhnaya, St. Petersburg 199034, Russia
Sergey V. Krivovichev
Affiliation:
Department of Crystallography, St. Petersburg State University, 7–9 Universitetskaya Naberezhnaya, St. Petersburg 199034, Russia
Carmela Petti
Affiliation:
Centro Museale “Centro Musei delle Scienze Naturali e Fisiche”, University of Naples Federico II, Via Mezzocannone 8, 80134 Napoli, Italy
Piergiulio Cappelletti
Affiliation:
Department of Earth Science, Environment and Resources (DiSTAR), University of Naples Federico II, Via Cintia, 26, Naples I-80126, Italy Center for Research on Archaeometry and Conservation Science (CRACS), University of Naples Federico II, Via Cintia, 26, Naples I-80126, University of Sannio, Via dei Mulini 73, Benevento I-82100, Italy Centro Museale “Centro Musei delle Scienze Naturali e Fisiche”, University of Naples Federico II, Via Mezzocannone 8, 80134 Napoli, Italy
Nicola Mondillo
Affiliation:
Department of Earth Science, Environment and Resources (DiSTAR), University of Naples Federico II, Via Cintia, 26, Naples I-80126, Italy
Anna Moliterni
Affiliation:
Istituto di Cristallografia, CNR, Via Amendola 122/O, 70126 Bari, Italy
Angela Altomare
Affiliation:
Istituto di Cristallografia, CNR, Via Amendola 122/O, 70126 Bari, Italy
Francesco Izzo
Affiliation:
Department of Earth Science, Environment and Resources (DiSTAR), University of Naples Federico II, Via Cintia, 26, Naples I-80126, Italy Center for Research on Archaeometry and Conservation Science (CRACS), University of Naples Federico II, Via Cintia, 26, Naples I-80126, University of Sannio, Via dei Mulini 73, Benevento I-82100, Italy
*
Corresponding author: Taras L. Panikorovskii; Email: t.panikorovskii@ksc.ru
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Abstract

Enricofrancoite (IMA2023–002), ideally KNaCaSi4O10, is a new litidionite-group member found as the product of high-temperature alteration of hosting silicates with the enrichment by Cu-bearing fluids at the rock–fumaroles interface related to the 1872 eruption of Somma–Vesuvius volcano, southern Italy. It occurs as euhedral and platy crystals or crusts together with litidionite, tridymite, wollastonite and Al- and Fe-bearing diopside, kamenevite, perovskite, rutile, Ti-rich magnetite and colourless Si-glass. Single crystals of enricofrancoite are transparent colourless or light blue with a vitreous lustre. Mohs hardness is 5.5. Dmeas is 2.63(3) g/cm3 and Dcalc is 2.63 g/cm3. The mineral is optically biaxial (−), α = 1.542(5), β = 1.567(5),γ = 1.575(5); 2V(meas) = 60(2)° and 2Vcalc = 58°. The mean chemical composition (wt.%, electron-microprobe data) is: SiO2 64.81, Al2O3 0.03, TiO2 0.08, FeO 0.07, MgO 1.71, CaO 10.64, CuO 2.22, Na2O 8.56, K2O 11.41, total 99.94. The empirical formula based on 10 O apfu is: K0.90Na1.03(Ca0.71Mg0.16Cu0.10)Σ0.97Si4.02O10. The Raman spectrum contains bands at 133, 248, 265, 290, 335, 400, 438, 510, 600, 690 and 1120 cm–1 and the wavenumbers of the IR absorption bands are: 424, 470, 492, 530, 600, 630, 690, 750, 788, 970, 1040 and 1160 cm–1. The eight strongest lines of the powder X-ray diffraction pattern are [d, Å (I, %) hkl]: 6.75 (42) 01$\bar{1}$, 3.65 (20) 11$\bar{2}$, 3.370 (100) 02$\bar{2}$, 3.210 (52) 102, 3.051 (18) 111, 3.033 (25) 2$\bar{1}\bar{2}$, 2.834 (22) 02$\bar{3}$ and 2.411 (72) 03$\bar{2}$. Enricofrancoite is triclinic, space group P$\bar{1}$, unit-cell parameters refined from the single-crystal data are a = 7.0155(4) Å, b = 8.0721(4) Å, c = 10.0275(4) Å, α = 104.420(4)°, β = 99.764(4)°, γ = 115.126(5)° and V = 472.74(5) Å3. The crystal structure has been refined from single-crystal X-ray diffraction data to R1 = 0.035 on the basis of 2078 independent reflections with Fo > 4σ(Fo). Enricofrancoite is an H2O-free analogue of calcinaksite with 5-coordinated Ca2+ at the M site.

Keywords

new mineralenricofrancoitelitidionite groupcrystal structureSomma–VesuviusItaly
Type
Article
Information
Mineralogical Magazine , First View , pp. 1 - 11
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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Footnotes

Associate Editor: Juraj Majzlan

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