Figure F67. Combined plane-polarized transmitted and reflected light photomicrograph showing pyrite overgrowing a dark magnetite-bearing aggregate. Note the fine lamellae of magnetite in the opaque area of the slide and the magnetite inclusions in pyrite (interval 193-1188F-40Z-1, 3-5 cm; Unit 65; width of view = 0.7 mm. Photomicrograph ID# 1188F_96; thin section 106).