Figure F5. The groundmass of Unit 5 is rich in plagioclase microlites showing a pilotaxitic texture. Vesicles are abundant and typically partially filled with silica, zeolite, and/or anhydrite. Here, a radiating crystal aggregate of zeolite is attached to the inner surface of a vesicle and covered by a thin lining of opaline silica (Sample 193-1189A-3R-1 [Piece 2, 6-10 cm]; width of view = 1.38 mm. Photomicrograph ID# 1189A

Figure F5. The groundmass of Unit 5 is rich in plagioclase microlites showing a pilotaxitic texture. Vesicles are abundant and typically partially filled with silica, zeolite, and/or anhydrite. Here, a radiating crystal aggregate of zeolite is attached to the inner surface of a vesicle and covered by a thin lining of opaline silica (Sample 193-1189A-3R-1 [Piece 2, 6-10 cm]; width of view = 1.38 mm. Photomicrograph ID# 1189A_12; thin section 32).