A Unique Amphibole- and Magnetite-Rich Carbonaceous Chondrite Clast from Almahata Sitta

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C. A. Goodrich, V. E. Hamilton, M. E. Zolensky, N. T. Kita, A. M. Fioretti, I. Kohl, E. Young, A. H. Treiman, H. C. Connolly Jr, J. Filiberto, M. H. Shaddad, P. Jenniskens

51st Lunar and Planetary Science Conference (2020), Abstract #1223

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“Almahata Sitta (AhS) 202 from the Univ. of Khartoum collection [1] is a clast from the polymict breccia asteroid 2008 TC3 [2-4]. AhS 202 was recognized as a unique carbonaceous chondrite (CC) with abundant magnetite [5-7]. Here we report that it also contains a significant amount of amphibole, a mineral that is very rare in chondrites [8,9] and has not previously been reported in significant abundance in a CC [10,11]. We present new petrographic, oxygen isotope, and micro-FTIR [see 12] data. We discuss petrogenesis and possible relationships to known CC.”

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