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Discovery of Rubinite, Ca_3Ti^(3+)_2Si_3O_(12), a new Garnet Mineral in Refractory Inclusions from Carbonaceous Chondrites

Ma, Chi and Yoshizaki, Takashi and Krot, Alexander N. and Beckett, John R. and Nakamura, Tomoki and Nagashima, Kazuhide and Muto, Jun and Ivanova, Marina A. (2017) Discovery of Rubinite, Ca_3Ti^(3+)_2Si_3O_(12), a new Garnet Mineral in Refractory Inclusions from Carbonaceous Chondrites. Meteoritics and Planetary Science, 52 (S1). p. 211. ISSN 1086-9379. doi:10.1111/maps.12934.

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During a nanomineralogy investigation of carbonaceous chondrites, a new Ti^(3+)-dominant garnet, named “rubinite,” Ca_3Ti^(3+)_2Si_3O_(12) with the Ia^3d garnet structure, was identified in five Ca-Al-rich inclusions (CAIs) from the CV3 chondrites Vigarano, Allende, and Efremovka. Field-emission scanning electron microscope, electron back-scatter diffraction, electron microprobe and ion microprobe techniques were used to characterize the chemistry, oxygen-isotope compositions, and structure of rubinite and associated phases. Synthetic Ca_3Ti^(3+)_2Si_3O_(12) garnet was reported by [1]. Here, we describe the first natural occurrences of rubinite as a refractory mineral in primitive meteorites. The mineral has been approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA 2016-110) [2]. The name honors Alan E. Rubin, a cosmochemist at University of California, Los Angeles (UCLA), USA, for his many contributions to cosmochemistry and meteorite research.

Item Type:Article
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URLURL TypeDescription
Ma, Chi0000-0002-1828-7033
Krot, Alexander N.0000-0002-2278-8519
Additional Information:© 2017 The Meteoritical Society. First published: 6 July 2017.
Issue or Number:S1
Record Number:CaltechAUTHORS:20170707-101252360
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Official Citation:(2017), 80th Annual Meeting of the Meteoritical Society (2017). Meteorit Planet Sci, 52: A1–A408. doi:10.1111/maps.12934
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78845
Deposited By: Tony Diaz
Deposited On:07 Jul 2017 17:23
Last Modified:15 Nov 2021 17:43

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