Figure F46. Texture of a fine-grained to partly glassy, sparsely olivine-phyric basalt in Sample 192-1183A-55R-4 (Piece 4, 38-41 cm), Unit 4B. Olivine phenocrysts, visible in the quench-textured groundmass, are replaced by clay (field of view = 2.8 mm; plane-polarized light; photomicrograph ID# 1183A

Figure F46. Texture of a fine-grained to partly glassy, sparsely olivine-phyric basalt in Sample 192-1183A-55R-4 (Piece 4, 38-41 cm), Unit 4B. Olivine phenocrysts, visible in the quench-textured groundmass, are replaced by clay (field of view = 2.8 mm; plane-polarized light; photomicrograph ID# 1183A_004).