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Discovery of a New Garnet Mineral, Ca_3Ti_2(SiAl_2)O_(12): An Alteration Phase in Allende

Ma, Chi and Krot, Alexander N. (2013) Discovery of a New Garnet Mineral, Ca_3Ti_2(SiAl_2)O_(12): An Alteration Phase in Allende. Meteoritics and Planetary Science, 48 (S1). A229. ISSN 1086-9379.

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During a nanomineralogy investigation of the Allende CV3 carbonaceous chondrite, a new Ti-rich silicate, Ca_3Ti_2(SiAl_2)O_(12) with the Ia-3d garnet structure, was identified in the Type B1 Ca,Al-rich inclusion (CAI) Egg-3. Field-emission SEM with EDS and electron back-scatter diffraction and electron microprobe were used to characterize the composition and structure. Synthetic Ca_3Ti_2(SiAl_2)O_(12) is not reported. We present here the natural occurrence of Ca_3Ti_2(SiAl_2)O_(12), as a new alteration silicate in a CAI, and discuss its origin and significance for secondary processes. The mineral is currently under review by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA 2013-029). It is a new member of the schorlomite group in the garnet supergroup.

Item Type:Article
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URLURL TypeDescription
Ma, Chi0000-0002-1828-7033
Krot, Alexander N.0000-0002-2278-8519
Alternate Title:Discovery of a New Garnet Mineral, Ca3Ti2(SiAl2)O12: An Alteration Phase in Allende
Additional Information:© 2013 The Meteoritical Society. Article first published online: 1 Jul. 2013.
Issue or Number:S1
Record Number:CaltechAUTHORS:20131206-092121397
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Official Citation:(2013), 76th Annual Meeting of the Meteoritical Society July 29-August 2, 2013. Meteoritics & Planetary Science, 48: A32–A394. doi: 10.1111/maps.12165
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42878
Deposited By: Tony Diaz
Deposited On:23 Dec 2013 19:28
Last Modified:09 Mar 2020 13:19

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