New Minerals from Inclusions in Corundum Xenocrysts from Mt. Carmel, Israel: Magnéliite, Ziroite, Sassite, Mizraite-(Ce) and Yeite

Ma, Chi; Cámara, Fernando; Bindi, Luca; Toledo, Vered; Griffin, William L.

doi:10.3390/ma16247578

Cited by 5 publications

(6 citation statements)

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“…This evidence has been summarized in detail in [12,13]. The latter reference presents U-Pb dating of carmeltazite and other super-reduced phases in the corundum aggregates, which shows a pattern of age distribution (Paleocene to Miocene, Cretaceous and older) that is consistent with zircon dating [14] of the volcanic rocks thought to be the immediate sources of the super-reduced phases [5]. It is clear from these data, as well as the geological context, that the Mount Carmel material was not produced by human beings.…”

Section: Methodsmentioning

confidence: 78%

“…Toledoite occurs with gupeiite (Fe 3 Si) [15], jingsuiite (TiB 2 ) [16], ziroite (ZrO 2 ) [5], osbornite (TiN) [17], xifengite (Fe 5 Si 3 ) [15], and naquite (FeSi) [18] in melt inclusions in corundum grain WG1124E-1 (Figure 2). Ti-bearing xifengite and osbornite are also present in the Allende meteorite [6].…”

Section: Resultsmentioning

confidence: 99%

“…The crystallization of Fe-free phases from silicate melt(s) is due to the immiscible separation of melts from the coexisting silicate melt under highly reducing conditions. Multiple stages of immiscibility, as well as the chemistry and evolution of these melts, are reported in [26]; like yeite (TiSi [5]), toledoite adds more detail to this picture.…”

Section: Discussionmentioning

confidence: 99%

“…Due to the small size of the crystal, conventional X-ray studies could not be carried out. Therefore, EBSD analyses at a submicrometer scale were carried out, as in other previous studies of new minerals [5], by using an HKL EBSD system mounted on the ZEISS 1550VP SEM. Operation conditions were 20 kV and 6 nA in focused-beam mode using a 70 • tilted stage, and in variable-pressure mode (25 Pa).…”

Section: Methodsmentioning

confidence: 99%

“…We have studied the mineralogy of crystals down to nanoscale in melt inclusions in corundum xenocrysts coming from volcanic centers and associated alluvial deposits in the Mount Carmel area, Israel. Since 2021, we have identified seven IMA-approved new minerals: griffinite (Al 2 TiO 5 ), magnéliite (Ti 3+ 2 Ti 4+ 2 O 7 ), ziroite (ZrO 2 ), sassite (Ti 3+ 2 Ti 4+ O 5 ), mizraite-(Ce) (Ce(Al 11 Mg)O 19 ), toledoite (TiFeSi), and yeite (TiSi) [5]. Reported here is toledoite; we will also provide additional information on the origin and stability of reduced high-temperature minerals from the upper mantle.…”

Section: Introductionmentioning

confidence: 99%

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Toledoite, TiFeSi, a New Mineral from Inclusions in Corundum Xenocrysts from Mount Carmel, Israel

Ma,

Cámara,

Bindi

et al. 2024

Crystals

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During our nanomineralogical investigation of melt inclusions in corundum xenocrysts from the Mount Carmel area, Israel, seven new oxide and alloy minerals have been discovered since 2021. Herein, we report toledoite (TiFeSi; IMA 2022-036), a new alloy mineral. Toledoite occurs as irregular crystals 2–16 μm in size, with gupeiite (Fe3Si), jingsuiite (TiB2), ziroite (ZrO2), osbornite (TiN), xifengite (Fe5Si3), and naquite (FeSi) in corundum Grain WG1124E-1. Toledoite has an empirical formula (Ti0.83Cr0.07Mn0.06V0.02)(Fe0.96Mn0.04)(Si0.99P0.04) and an orthorhombic Ima2 TiFeSi-type structure with the following cell parameters: a = 7.00(1) Å, b = 10.83(1) Å, c = 6.29(1) Å, V = 477(1) Å3, Z = 12. Toledoite is a high-temperature alloy phase, formed under extremely reduced conditions in melt pockets in corundum xenocrysts derived from the upper mantle beneath Mount Carmel in Israel. The name was given in honor of Vered Toledo, of Shefa Gems Ltd. for her support and for providing corundum xenocrysts from the Mount Carmel region for this investigation of new minerals.

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Section: Methodsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Toledoite, TiFeSi, a New Mineral from Inclusions in Corundum Xenocrysts from Mount Carmel, Israel

Ma,

Cámara,

Bindi

et al. 2024

Crystals

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Interactions of magmas and highly reduced fluids during intraplate volcanism, Mt Carmel, Israel: Implications for mantle redox states and global carbon cycles

Griffin,

Bindi,

Cámara

et al. 2024

Gondwana Research

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Petrography, Crystallography, and Geochronology of Baddeleyite With Two Morphologies in a Chang'e‐5 Lunar Basalt

Huang,

Xu,

Qin

et al. 2024

JGR Planets

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Baddeleyite (ZrO2) is widespread in lunar basalts and frequently used for U‐Pb geochronology of magmatic and impact events. The formation of baddeleyite involves two primary mechanisms: (a) crystallization from late‐stage magma, and (b) decomposition of zircon under high‐temperature (high‐T) conditions. Baddeleyite with distinct formation mechanisms commonly displays different morphologies. In a Chang'e‐5 lunar basalt, we report baddeleyite with two different morphologies, termed “singular type” and “aggregate type.” Petrographic and crystallographic analyses were conducted on both types of baddeleyite to understand their formation conditions and evolution processes. Despite the similarity in the morphology and mineral assemblages between the aggregate type baddeleyite and zircon decomposition products, the petrographic characteristics and the rarity of zircon in lunar basalts tend to suggest that both types of baddeleyite are derived from magma crystallization. Crystallographic relationships observed in both types indicate a phase transformation from the precursor tetragonal‐ZrO2/cubic‐ZrO2 or orthorhombic‐ZrO2 phase. Two potential scenarios are proposed for the formation of these microstructures: (a) direct crystallization of high symmetry ZrO2 from magma, and (b) crystallization of baddeleyite from magma followed by a high‐pressure (high‐P) event causing its phase transition. However, due to unresolved scientific issues in both scenarios, an accurate evolutionary process cannot currently be determined. Therefore, extensive thermodynamic experiments are necessary to enhance our understanding of baddeleyite microstructures as indicators of P‐T processes, providing insights into magmatism and the impact history of planetary bodies.

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New Minerals from Inclusions in Corundum Xenocrysts from Mt. Carmel, Israel: Magnéliite, Ziroite, Sassite, Mizraite-(Ce) and Yeite

Cited by 5 publications

References 44 publications

Toledoite, TiFeSi, a New Mineral from Inclusions in Corundum Xenocrysts from Mount Carmel, Israel

Toledoite, TiFeSi, a New Mineral from Inclusions in Corundum Xenocrysts from Mount Carmel, Israel

Interactions of magmas and highly reduced fluids during intraplate volcanism, Mt Carmel, Israel: Implications for mantle redox states and global carbon cycles

Petrography, Crystallography, and Geochronology of Baddeleyite With Two Morphologies in a Chang'e‐5 Lunar Basalt

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