The Matrix Lithologies of the Primitive CR chondrite MIL 090657

Abstract

Recent studies showed similarities between amorphous silicates in matrices of pristine carbonaceous chondrites and GEMS in cometary dust, suggesting that pre-accretional materials could be well preserved in such primitive meteorites. MIL 090657, a minimally altered CR chondrite, is known to have 3 types of lithologies, one of which is dominated by amorphous silicates like GEMS. In this study, we examined MIL 090657 matrix with an FE-SEM and a TEM to reveal the distribution of the lithologies.