Figure F94. Euhedral quartz (quartz-1, dark gray) overgrown by a second quartz (quartz-2, gray) containing inclusions of magnetite (medium gray), which are in turn overgrown by pyrite (white). An anhydrite vein (high relief, mottled gray) is present in a fracture in quartz-1 near the center of the photomicrograph (Sample 193-1188F-26Z-1 [Piece 2, 20-23 cm] in reflected light; width of view = 0.70 mm. Photomicrograph ID# 1188F

Figure F94. Euhedral quartz (quartz-1, dark gray) overgrown by a second quartz (quartz-2, gray) containing inclusions of magnetite (medium gray), which are in turn overgrown by pyrite (white). An anhydrite vein (high relief, mottled gray) is present in a fracture in quartz-1 near the center of the photomicrograph (Sample 193-1188F-26Z-1 [Piece 2, 20-23 cm] in reflected light; width of view = 0.70 mm. Photomicrograph ID# 1188F_37; thin section 90).