Figure F26. A. Photomicrograph (in reflected light) of a skeletal titanomagnetite from the inner part of a pillow lava (Unit 6) in Sample 183-1140-37R-1 (Piece 1C, 46-49 cm). This texture reflects a rapid crystallization of the lava (see Fig. F19). Sulfide (pyrite or pentlandite) is present around and as minute inclusions (small bright grains) in the titanomagnetite grain. B. Photomicrograph (in reflected light) of secondary pyrite between plagioclase laths (Unit 2) in Sample 183-1140-31R-1 (Piece 3B, 53-57 cm).