Microstructure and crystallographic information of space-weathered troilite and its nearby minerals. (a) BF image showing the microstructure of space-weathered troilite. (b) HAADF image of space-weathered silicate minerals (Opx and Cpx) near the troilite. (c) HRTEM image of the junction between iron whiskers and the underlying troilite crystal. The fast Fourier transform image (FFT) patterns of the crystal and the crystallographic information are marked in the figure. (d) HRTEM image of the porous texture. The FFT and crystallographic information are shown in the figures. Crystallographic information is annotated using CrysTBox (M. Klinger 2017).