Figure 39. Photomicrograph (plane polarized light) of the glass from a chilled pillow margin from Unit 1 containing fresh, euhedral olivine phenocrysts (characteristic six-sided shape; center) with inclusions of two small chromites and glass (left of the crystal) in thin section 183-1140A-26R-1, 5 18 cm (Piece 1A). The chromite inclusions in the olivine indicate early oxide precipitation.

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Figure 39