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Back-scattered electron images (BEI) of some distinctive mineralogic features of AhS 91A and AhS 671. (a) A currently unidentifed Ca-rich silicate phase occurs commonly as fibrous laths and clumps, (b) Fayalite-rich olivine (Fo ~20-30) occurs as fibrous laths and clumps, and also commonly as rims around grains or aggregates of grains of magnetite. Abbreviations: mgt = magnetite; fay = fayalitic olivine.
