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Discovery of a New Cl-Rich Silicate Mineral, Ca_(12)(Al_2Mg_3Si_7)O_(32)Cl_6: An Alteration Phase in Allende

Ma, Chi and Krot, Alexander N. (2014) Discovery of a New Cl-Rich Silicate Mineral, Ca_(12)(Al_2Mg_3Si_7)O_(32)Cl_6: An Alteration Phase in Allende. Meteoritics and Planetary Science, 49 (S1). A248. ISSN 1086-9379. http://resolver.caltech.edu/CaltechAUTHORS:20141023-110112876

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Abstract

During a nanomineralogy investigation of the Allende CV3 carbonaceous chondrite, a new silicate mineral, Ca_(12)(Al_4Mg_3Si_7)O_(32)Cl_6 with the I 4 3d wadalite 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 its composition, structure, and associated phases. Synthetic Ca_(12)(Al_4Mg_3Si_7)O_(32)Cl_6 are not reported. The Allende Ca_(12)(Al_4Mg_3Si_7)O_(32)Cl_6 is the first natural occurrence of this phase. Here we discuss its origin and significance for understanding alteration processes on the CV chondrite parent asteroid. The mineral is currently under review by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA 2014-028). It is a new member of the wadalite group.


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http://dx.doi.org/10.1111/maps.12359DOIAbstracts
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Additional Information:© 2014 The Meteoritical Society. Article first published online: 8 Sep. 2014.
Record Number:CaltechAUTHORS:20141023-110112876
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141023-110112876
Official Citation:(2014), 77th Annual Meeting of the Meteoritical Society September 8–13, 2014. Meteoritics & Planetary Science, 49: A5–A454. doi: 10.1111/maps.12359
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50735
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Oct 2014 18:49
Last Modified:03 Dec 2014 23:03

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