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SEM images of a section of Isua peridotite 8c. atg: antigorite; ol: olivine; Co-ptl: cobaltian pentlandite; ox: oxide (Fe-Ni-Cr). (A) Only one sulfide (black circle) is present. (B) The sulfide is cobaltian-pentlandite (Fe19Ni29Co4S48). (C) Other white spots in A are not sulfides but oxides as analyzed by EDS.
