SEM-BSE images of the four zones together with their Chelyabinsk meteorite lithology equivalents. The inset in zone IV shows a detail of olivine skeletal structure and the metal and troilite redistribution into fine eutectic micro- and nanoparticles (bright blebs), causing the observed optical darkening. The yellow box in the impact melt lithology shows an area with needle olivine crystals in quenched melt, similar to those observed by Kaeter et al. (2018). QM, Ol, Opx, and Tr stand for quenched melt, olivine, orthopyroxene, and troilite, respectively.