Ma, Chi and Krot, Alexander N. and Paque, Julie and Tschauner, Oliver and Nagashima, Kazuhide (2021) Beckettite, Ca₂V₆Al₆O₂₀, a new mineral in a Type A refractory inclusion from Allende and clues to processes in the early solar system. Meteoritics and Planetary Science, 56 (12). pp. 2265-2272. ISSN 1086-9379. doi:10.1111/maps.13771. https://resolver.caltech.edu/CaltechAUTHORS:20211208-560283000
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MS Word (Fig S1. BSE image showing SIMS pits on beckettite, hibonite, and spinel in the Allende CAI A-WP1)
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MS Word (Table S1. Calculated X-ray powder diffraction data for beckettite (I_(rel) > 1))
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Abstract
Beckettite (Ca₂V₆Al₆O₂₀; IMA 2015-001) is a newly discovered refractory mineral, occurring as micrometer-sized grains intergrown with hibonite and perovskite, and surrounded by secondary grossular, anorthite, coulsonite, hercynite, and corundum. It occurs within highly altered areas in a V-rich, Type A Ca-Al-rich inclusion (CAI), A-WP1, from the Allende CV3 carbonaceous chondrite. The type beckettite has an empirical formula of (Ca_(1.99)Na_(0.01))(V³⁺_(3.47)Al_(1.40)Ti⁴⁺_(0.57)Mg_(0.25)Sc_(0.08)Fe²⁺_(0.04))(Al_(5.72)Si_(0.28))O₂₀, with a triclinic structure in space group P1 and cell parameters a = 10.367 Å, b = 10.756 Å, c = 8.895 Å, α = 106.0°, β = 96.0°, γ = 124.7°, V = 739.7 Å3, and Z = 2, which leads to a calculated density of 3.67 g cm⁻³. Beckettite’s general formula is Ca₂(V,Al,Ti,Mg)₆Al₆O₂₀ and the endmember formula is Ca2V6Al6O20. Beckettite is slightly ¹⁶O-depleted (Δ¹⁷O = −16 ± 2‰) compared to the coexisting hibonite and spinel −24 ± 2‰. Beckettite is a primary high-temperature mineral resulting from igneous crystallization of an ¹⁶O-rich V-rich CAI melt together with V-bearing hibonite, perovskite, burnettite, spinel, and paqueite. Subsequently, beckettite experienced an incomplete isotope exchange with an ¹⁶O-poor aqueous fluid (Δ¹⁷O = −3 ± 2‰) on the Allende parent asteroid.
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Alternate Title: | Beckettite, Ca2V6Al6O20, a new mineral in a Type A refractory inclusion from Allende and clues to processes in the early solar system | ||||||||||||
Additional Information: | © 2021 The Meteoritical Society (MET). Issue Online: 28 December 2021; Version of Record online: 07 December 2021; Manuscript accepted: 12 November 2021; Manuscript received: 30 September 2021. SEM, EBSD, and EPMA analyses were carried out at the Caltech GPS Division Analytical Facility, which is supported, in part, by NSF Grants EAR-0318518 and DMR-0080065. We thank Samuel Ebert and associate editor Yves Marrocchi for their constructive reviews. Data Availability Statement. Data available on request from the authors. | ||||||||||||
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Issue or Number: | 12 | ||||||||||||
DOI: | 10.1111/maps.13771 | ||||||||||||
Record Number: | CaltechAUTHORS:20211208-560283000 | ||||||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20211208-560283000 | ||||||||||||
Official Citation: | Ma, C., Krot, A.N., Paque, J., Tschauner, O. and Nagashima, K. (2021), Beckettite, Ca2V6Al6O20, a new mineral in a Type A refractory inclusion from Allende and clues to processes in the early solar system. Meteorit Planet Sci, 56: 2265-2272. https://doi.org/10.1111/maps.13771 | ||||||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||||||||
ID Code: | 112282 | ||||||||||||
Collection: | CaltechAUTHORS | ||||||||||||
Deposited By: | George Porter | ||||||||||||
Deposited On: | 09 Dec 2021 17:47 | ||||||||||||
Last Modified: | 03 Jan 2022 22:19 |
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