Gorerite, CaAlFe11O19, a new mineral of the magnetoplumbite group from the Negev Desert, Israel
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MGM2400030_snapshot.pdf (1.42 MB)
0000-0002-7018-527X Date
2024
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Cambridge University Press
Abstract
Gorerite, ideally CaAlFe11O19 is a new mineral and M-type hexaferrite of the magnetoplumbitе 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 tu 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 directly crystallize from the melt. Instead, it emerged through a reaction involving earlier crystallized 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, 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 crystallizes 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 characterized by an intercalation of triple spinel-like S-blocks and rock-salt type R-blocks along the hexagonal c-axis.
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Galuskin, Evgeny V., Biljana Krüger, Irina O. Galuskina, Hannes Krüger, Krzysztof Nejbert, and Yevgeny Vapnik. “Gorerite, CaAlFe11O19, a New Mineral of the Magnetoplumbite Group from the Negev Desert, Israel.” Mineralogical Magazine 88, no. 4 (2024): 451–60. https://doi.org/10.1180/mgm.2024.30.