Fig. 1: SEM and EMPA data from Bennu particles.
From: Mineralogical evidence for hydrothermal alteration of Bennu samples
a, BSE image of an angular particle from sample OREX-803095-0. b, BSE image of a hummocky particle from OREX-803096-0. c–e, BSE images of carbonate (OREX-803095-0), sulfide (OREX-803095-0) and magnetite (OREX-501030-0) grains. Yellow arrows point to pitting on grain surfaces. f, Fe+Co-Ni-S ternary diagram showing the composition of sulfides in samples OREX-803095-0, OREX-803096-0, OREX-803066-0, OREX-803067-0 and OREX-803070-0, together with reference sulfides. CI chondrite data from Bullock et al.12. *Stoichiometric sulfides include pyrrhotite Fe7S8 (4C), Fe9S10 (5C), Fe11S12 (6C) and Fe10S11 (11C); troilite (FeS) and pyrite (FeS2) for reference. g, BSE image of olivine from OREX-501019-0. h, Secondary-electron image of pyroxene from OREX-501059-0. i, BSE image of spinel from OREX-501019-101.
