Figure 4. Results of SEM analysis on the polished cross-section of the recovered sample.

The sample number is #A0161. (a) Representative electron image together with (b) enlarged image of the area surrounded by a red square, and (c) elemental maps (O, Si, Mg and Fe). The scale bars in a,b indicate 100 and 10 μm, respectively. The bright area is metallic iron; a thin FeO layer formed on the surface of the iron in (a). Small black or grey dots in iron are vacant holes as clearly shown in b. Ol stands for olivine, and Px denotes pyroxene. The surrounding mixture of Mg(OD)₂ and SiO₂ changed into olivine and pyroxene containing Fe. The former is preferentially located close to the iron in c.