A Caltech Library Service

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. doi:10.1111/maps.12359.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ma, Chi0000-0002-1828-7033
Krot, Alexander N.0000-0002-2278-8519
Additional Information:© 2014 The Meteoritical Society. Article first published online: 8 Sep. 2014.
Issue or Number:S1
Record Number:CaltechAUTHORS:20141023-110112876
Persistent URL:
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
Deposited By: Tony Diaz
Deposited On:23 Oct 2014 18:49
Last Modified:10 Nov 2021 19:00

Repository Staff Only: item control page