Figure F29. Photomicrograph from Unit VII (Sample 194-1193C-8R-3, 123 cm; 542.8 mbsf). This hydrothermally altered basaltic rock consists of a patchwork of areas composed mostly of very fine crystalline alteration products. Enclosing areas have a partly altered igneous texture, such as in the view shown here. Plagioclase phenocrysts of varying size and degree of alteration are surrounded by dark areas representing former groundmass or glass.

Figure F29. Photomicrograph from Unit VII (Sample 194-1193C-8R-3, 123 cm; 542.8 mbsf). This hydrothermally altered basaltic rock consists of a patchwork of areas composed mostly of very fine crystalline alteration products. Enclosing areas have a partly altered igneous texture, such as in the view shown here. Plagioclase phenocrysts of varying size and degree of alteration are surrounded by dark areas representing former groundmass or glass.