Electron microscope images of C0242 and A0226 particles. (a), (c) Frothy surface of A0266 particle in secondary electron (SE) mode. (b), (d) Smooth phyllosilicate-rich matrix on the surface of C0242 particle in SE mode. (e) Incipient space weathering features on the surface of pyrrhotite grains found in the A0226 surface in BSE mode. (f) Smooth pyrrhotite surface in C0242 particle imaged in BSE mode. (g) Incipient space weathering features on the surface of magnetite grain in A0226 imaged in SE mode. (h) Smooth magnetite grain in C0242 particle imaged in SE mode.