Microstructure and compositional features of space-weathered troilite and its nearby minerals. (a) HAADF image of the FIB foil. The white dashed rectangle indicates the region shown in Figure 3(b). (b), (e) HAADF image of the enlarged iron whiskers and porous texture. (c), (d) TEM-EDS compositional analysis (Fe, S, and Pt) of the space-weathered troilite. The dashed line outlines the porous texture. (f)–(h) TEM-EDS compositional analysis (Fe, S, and Pt) of the space-weathered troilite.