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

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


“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.”