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Hibonite-(Fe),(Fe,Mg)Al_(12)O_19, a new alteration mineral from the Allende meteorite

Ma, Chi (2010) Hibonite-(Fe),(Fe,Mg)Al_(12)O_19, a new alteration mineral from the Allende meteorite. American Mineralogist, 95 (1). pp. 188-191. ISSN 0003-004X.

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Hibonite-(Fe),(Fe,Mg)Al_(12)O_19, is the Fe^(2+)-dominant analog of hibonite CaAl_(12)O_19, discovered in a highly altered Ca-,Al-rich refractory inclusion from the Allende meteorite. It occurs as scattered micrometer-sized single crystals within an aggregate of hercynite (Fe,Mg)Al_(2)O_4, adjacent to nepheline, ilmenite, ferroan spinel, perovskite, and hibonite. The mean chemical composition determined by electron microprobe analysis of hibonite-(Fe) is Al_(2)O_3 90.05 wt%, FeO 3.60, SiO_2 2.09, MgO 1.61, Na_(2)O 0.55, CaO 0.28, TiO_2 0.04, V_(2)O_3 0.02, sum 98.25, corresponding to an empirical formula of (Fe^(2+)_(0.34)Mg_(0.27)Na_(0.12)Al_(0.11)Ca_(0.03))_(Σ0.87) (Al_(11.77)Si_(0.23))_(Σ12.00)O_(19). Hibonite-(Fe) is hexagonal, P6_(3)/mmc; a = 5.613 Å, c = 22.285 Å, V = 608.0 Å^3 and Z = 2. Its electron backscatter diffraction pattern is a good match to that of the hibonite structure. Hibonite-(Fe) is apparently a secondary alteration product formed by iron-alkali-halogen metasomatism, whereas hibonite is a primary refractory phase.

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Ma, Chi0000-0002-1828-7033
Additional Information:© 2010 Mineralogical Society of America. Manuscript received August 2, 2009; manuscript accepted August 20, 2009; manuscript handled by Bryan Chakoumakos. The Caltech Analytical Facility at the Division of Geological and Planetary Sciences is supported, in part, by grant NSF EAR-0318518 and the MRSEC Program of the NSF under DMR-0080065. The author thanks George Rossman for assistance with micro-Raman analysis, John Beckett for discussion on the formation and alteration of CAIs, Christine Floss and Steve Simon for constructive reviews of this manuscript.
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Subject Keywords:Hibonite-(Fe), (Fe,Mg)Al_(12)O_19, a new Al-rich mineral, refractory inclusion, secondary alteration, Allende meteorite, carbonaceous chondrite, nanomineralogy
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Record Number:CaltechAUTHORS:20100201-114936034
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17364
Deposited By: Jason Perez
Deposited On:04 Feb 2010 21:43
Last Modified:09 Mar 2020 13:19

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