Mineralogy of NWA 3222 ureilite and its relationship with Hughes 009 type ureilites

Abstract

Most ureilites are thought to be partial melt residues but some of augite-bearing ureilites can be interpreted as cumulates. In this study, we studied new Hughes 009 type ureilite NWA 3222 and found that it shares many mineralogical characteristics with other these types. In addition, augites in NWA 3222 show remarkable chemical zoning and we detected similar subtle zonation in FRO 90054. These compositional similarity suggest that they were derived from the same lithologic unit on UPB.