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Hutcheonite, Ca_3Ti_2(SiAl_2)O_(12), a new garnet mineral from the Allende meteorite: An alteration phase in a Ca-Al-rich inclusion

Ma, Chi and Krot, Alexander N. (2014) Hutcheonite, Ca_3Ti_2(SiAl_2)O_(12), a new garnet mineral from the Allende meteorite: An alteration phase in a Ca-Al-rich inclusion. American Mineralogist, 99 (4). pp. 667-670. ISSN 0003-004X. doi:10.2138/am.2014.4761.

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Hutcheonite (IMA 2013-029), Ca_3Ti_2(SiAl_2)O_(12), is a new garnet mineral that occurs with monticellite, grossular, and wadalite in secondary alteration areas along some cracks between primary melilite, spinel, and Ti,Al-diopside in a Type B1 Fractionation and Unidentified Nuclear effects (FUN) Ca-Al-rich inclusion (CAI) Egg-3 from the Allende CV (Vigarano type) carbonaceous chondrite. The mean chemical composition of type hutcheonite by electron probe microanalysis is (wt%) CaO 34.6, TiO_2 25.3, SiO_2 20.9, Al_2O_3 15.7, MgO 2.1, FeO 0.7, V_2O_3 0.5, total 99.8, giving rise to an empirical formula of Ca_(2.99)(Ti^(4+)_(1.53)Mg_(0.25)Al_(0.17)Fe^(2+)_(0.05)V^(3+)_(0.03))(Si_(1.68)Al_(1.32))O_(12). The end-member formula is Ca_3Ti_2(SiAl_2)O_(12). Hutcheonite has the Ia3̄d garnet structure with a = 11.843 Å, V = 1661.06 Å^3, and Z = 8, as revealed by electron backscatter diffraction. The calculated density using the measured composition is 3.86 g/cm^3. Hutcheonite is a new secondary phase in Allende, apparently formed by iron-alkali-halogen metasomatic alteration of the primary CAI phases like melilite, perovskite, and Ti,Al-diopside on the CV chondrite parent asteroid. Formation of the secondary Ti-rich minerals like hutcheonite during the metasomatic alteration of the Allende CAIs suggests some mobility of Ti during the alteration. The mineral name is in honor of Ian D. Hutcheon, a cosmochemist at Lawrence Livermore National Laboratory, California, U.S.A.

Item Type:Article
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URLURL TypeDescription DOIArticle
Ma, Chi0000-0002-1828-7033
Krot, Alexander N.0000-0002-2278-8519
Additional Information:© 2014 Mineralogical Society of America. Manuscript received September 30, 2013. Manuscript accepted October 24, 2013. Manuscript handled by Ian Swainson. SEM, EBSD, and EPMA were carried out at the Geological and Planetary Science Division Analytical Facility, Caltech, which is supported in part by NSF grants EAR-0318518 and DMR-0080065. This work was also supported by NASA grant NNX12AJ01G. We thank Edward S. Grew, Alan Rubin, and editor Ian Swainson for very helpful and constructive reviews of this manuscript.
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Subject Keywords:Hutcheonite, Ca_3Ti_2(SiAl_2)O_(12), new mineral, schorlomite group, garnet supergroup, Allende meteorite, carbonaceous chondrite, Ca-Al-rich inclusion
Issue or Number:4
Record Number:CaltechAUTHORS:20140519-113542155
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Official Citation: Chi Ma and Alexander N. Krot Hutcheonite, Ca3Ti2(SiAl2)O12, a new garnet mineral from the Allende meteorite: An alteration phase in a Ca-Al-rich inclusion American Mineralogist, , v. 99, p. 667-670, doi:10.2138/am.2014.4761
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45825
Deposited By: Ruth Sustaita
Deposited On:19 May 2014 21:23
Last Modified:10 Nov 2021 17:16

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