Host: Japan Association of Mineralogical Sciences
NWA 5480 is a crystalline stone, but shows a heterogeneous texture. Olivine aggregates and grains of olivine and chromite show resorption textures and set in a crystalline pyroxene matrix. Flow textures are observed near olivine aggregates. Olivine, chromite, and pyroxene show minor chemical zoning, implying relatively rapid cooling. NWA 5480 contains a significant amount of platinum group elements with chondritic relative proportions. All these evidence support that NWA 5480 is an impact melt rock from a target composed olivine and pyroxene-rich lithologies. Such impact melt would have formed by melting crustal materials.
