Figure F115. A. Pyrite (stage 1) lining the vein wall; anhedral chalcopyrite and euhedral pyrite (stage 2) in the vein center (Thin Section 111; Sample 309-1256D-136R-1, 121–123 cm) (field of view [FOV] = 5 mm; reflected light). B. Complex hydrothermal vein composed of two generations of pyrite, chlorite, quartz, prehnite (dusty, upper part of the vein), and calcite (lower part of the vein with cleavage) (Thin Section 111; Sample 309-1256D-136R-1, 121–123 cm) (FOV = 5 mm; plane-polarized light).
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