Figure F36. Perlitic texture preserved in the central part of a clay-altered volcanic clast (with a plagioclase phenocryst), which is hosted in a jasperoidal quartz stockwork matrix (Unit 5; Sample 193-1189B-6R-1 [Piece 2, 13-15 cm]; width of view = 5.5 mm. Photomicrograph ID# 1189B

Figure F36. Perlitic texture preserved in the central part of a clay-altered volcanic clast (with a plagioclase phenocryst), which is hosted in a jasperoidal quartz stockwork matrix (Unit 5; Sample 193-1189B-6R-1 [Piece 2, 13-15 cm]; width of view = 5.5 mm. Photomicrograph ID# 1189B_26; thin section 116).