R5: Extraterrestrial materials

[R5-10] Minor phases in CI chondrites

*Taro Ando¹, Takaaki Noguchi¹, Shoichi Itoh¹ (1. Kyoto Univ. Sci.)

Keywords:CI chondrites, Hayabusa 2, Ryugu

Most of the precursor materials of the CI chondrites have been lost during aqueous alteration. Therefore, their properties remain unclear. Revealing the precursors will lead to a better understanding of the Ryugu samples. Here, we report the minor phases in Ivuna and Orgueil that are considered to be the precursors. We identified olivine, spinel, perovskite, hibonite, Os-Ir-Pt alloy, and Fe, Cr-sulfide, indicating that the precursors contain minerals that formed in various environments.