Figure F92. Magnetite (gray) inclusions in pyrite (white) having the same morphology as those in the neighboring quartz (black) in the groundmass. Magnetite inclusions in the center of the pyrite grain are smaller than those near the edge suggesting that the former have been partially replaced (Sample 193-1188F-25Z-1 [Piece 4, 24-26 cm] in reflected light; width of view = 0.275 mm. Photomicrograph 1188F_71).