Figure F39. Photomicrograph (plane-polarized light) of glass in a chilled pillow margin from Unit 1 containing fresh, euhedral olivine phenocrysts (center) with inclusions of chromite and glass (left side of chromite crystals). The chromite inclusions in the olivine indicate early oxide precipitation. Sample 183-1140A-26R-1 (Piece 1A, 5-18 cm).