Figure F33. A. Photograph of semimassive sulfide consisting of pyrite and chalcopyrite grains in an anhydrite-silica matrix. Angular white fragments are altered volcanic rock (interval 193-1189A-12R-1, 120-128 cm). B. Photomicrograph of volcanic clasts (former tube pumice) with fibrous, laminate internal texture (arrow), which are abundant in this sulfide-rich interval (Sample 193-1189A-12R-1 [Piece 16, 122-125 cm]; width of view - 1.38 mm. Photomicrograph ID# 1189A

Figure F33. A. Photograph of semimassive sulfide consisting of pyrite and chalcopyrite grains in an anhydrite-silica matrix. Angular white fragments are altered volcanic rock (interval 193-1189A-12R-1, 120-128 cm). B. Photomicrograph of volcanic clasts (former tube pumice) with fibrous, laminate internal texture (arrow), which are abundant in this sulfide-rich interval (Sample 193-1189A-12R-1 [Piece 16, 122-125 cm]; width of view - 1.38 mm. Photomicrograph ID# 1189A_76, thin section 42).