Fig. 5.

Alteration of minerals and insoluble organic matter. (A) S-XRD profiles of the matrix in NWA 7020. The matrix is dominated by phyllosilicates (saponite and serpentine) based on the presence of basal and prism reflections of these minerals. (B) S-XRD profiles of the matrix in NWA 801, indicating that anhydrous silicates and FeNi metal kamacite are major phases. (C) Back-scattered electron image of a part of type I porphyritic olivine chondrule in NWA 801. The chondrule mesostasis glass (M) and kamacite (K) are almost free from aqueous alteration products. O represents olivine. (D) RAMP-CP-MAS ¹³C NMR spectra of IOM from NWA 7020 and NWA 7020. The aliphatic carbon signal of NWA 801 IOM is more abundant than the aromatic signal. The aromatic carbon signal and aliphatic signal of NWA 7020 IOM are comparable.