Figure F54. Basalt locally replaced by a prismatic zeolite (probably phillipsite) and smectite in the wall rock adjacent to a calcite + zeolite vein (outside field of view) in Sample 192-1185B-5R-8 (Piece 3, 31-33 cm). The subvariolitic texture of the basalt is preserved only in a few small areas (center left, lower center) (field of view = 5.5 mm; plane-polarized light; photomicrograph ID# 1185B

Figure F54. Basalt locally replaced by a prismatic zeolite (probably phillipsite) and smectite in the wall rock adjacent to a calcite + zeolite vein (outside field of view) in Sample 192-1185B-5R-8 (Piece 3, 31-33 cm). The subvariolitic texture of the basalt is preserved only in a few small areas (center left, lower center) (field of view = 5.5 mm; plane-polarized light; photomicrograph ID# 1185B_199).