BSE images of various spinel phases. Compositions for spinel phases shown here are provided in Table 2c. (a) Close up of region overlapping with Locations 11 (Fig. 2a) and 18 (Fig. 2b). Khatyrkite (“kh”) and stolperite (“st”) have a texture indicating crystallization from a melt. Metallic Fe beads (“Fe”) line the interior interface. Spinel crystals that grew here in the silicate melt (now glass) are denoted as “Sp-Mg”. They have lower concentrations of FeO and Fe2O3 than the spinel crystals shown in (b). (b) Close up of Location 20 (Fig. 2b) showing Fe-rich spinel crystals (“Sp-Fe”) and zoned spinel crystals with Fe-rich rims (also marked “Sp-Fe”) and Al-rich cores (“Sp-Al”), all surrounded by glass. In contrast to (a), this region does not have Fe beads, but the spinel crystals here have higher concentrations of FeO and Fe2O3 than those in (a). Also noted in the image are olivine crystals (“ol”, Fo50-Fo56).