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Gorerite, CaAlFe11O19, a new mineral of the magnetoplumbite group from the Negev Desert, Israel

Published online by Cambridge University Press:  23 April 2024

Evgeny V. Galuskin Open the ORCID record for Evgeny V. Galuskin [Opens in a new window] ,
Biljana Krüger Open the ORCID record for Biljana Krüger [Opens in a new window] ,
Irina O. Galuskina Open the ORCID record for Irina O. Galuskina [Opens in a new window] ,
Hannes Krüger ,
Krzysztof Nejbert Open the ORCID record for Krzysztof Nejbert [Opens in a new window]  and
Yevgeny Vapnik
Evgeny V. Galuskin*
Affiliation:
Institute of Earth Sciences, Faculty of Natural Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland
Biljana Krüger
Affiliation:
Institute of Mineralogy and Petrography, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria
Irina O. Galuskina
Affiliation:
Institute of Earth Sciences, Faculty of Natural Sciences, University of Silesia, Będzińska 60, 41-200 Sosnowiec, Poland
Hannes Krüger
Affiliation:
Institute of Mineralogy and Petrography, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria
Krzysztof Nejbert
Affiliation:
Faculty of Geology, University of Warsaw, Żwirki i Wigury 93, 02-089 Warszawa, Poland
Yevgeny Vapnik
Affiliation:
Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 84105, Israel
*
Corresponding author: Evgeny V. Galuskin; Email: evgeny.galuskin@us.edu.pl
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Abstract

Gorerite, ideally CaAlFe11O19 is a new mineral and M-type hexaferrite of the magnetoplumbite group. It was found in ferrite-rich segregations of esseneite–gehlenite–wollastonite–anorthite melted rock of the ‘olive’ subunit of pyrometamorphic rocks located near Hatrurim Junction in the Negev Desert, Israel. Within these ferrite-rich segregations up to 100 μm in size, platy crystals of gorerite up to 50 μm in size intergrow with hibonite, hematite, maghemite, magnesioferrite, dorrite, barioferrite and andradite, forming aggregates. Additionally, small crystals of gorerite occur within magnesioferrite. Importantly, gorerite did not crystallise directly from the melt. Instead, it emerged through a reaction involving earlier crystallised hibonite and an iron-enriched melt, resulting in the partial or complete replacement of hibonite by gorerite. Gorerite appears grey in the reflected light (R = 18–23%), displaying distinct bireflectance: dark-grey perpendicular to Z and light-grey parallel to Z. Its Raman spectrum exhibits only one strong band at 700 cm–1, which shifts to higher frequencies with increasing Al content. Gorerite crystallises in the P63/mmc space group, with lattice parameters a = 5.8532(4) Å, c = 22.7730(2) Å and V = 675.67(7) Å3 with Z = 2. It exhibits a structure characterised by an intercalation of triple spinel-like S blocks and rock-salt type R blocks along the hexagonal c-axis.

Keywords

goreritenew mineralstructureRamanmagnetoplumbite groupHatrurimIsrael
Type
Article
Information
Mineralogical Magazine , First View , pp. 1 - 10
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: David Hibbs

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