Figure F16. Photomicrograph (in plane-polarized light) of glass containing fresh, euhedral olivine phenocrysts (characteristic six-sided shape; center) from a chilled pillow margin (Unit 1). The largest olivine contains inclusions of two small chromite crystals and glass (left of the crystal) in Sample 183-1140-26R-1 (Piece 1A, 5-8 cm). The chromite inclusions in the olivine indicate early oxide precipitation.