Figure F55.
Photomicrographs (both in plane-polarized light) of altered mafic phenocrysts (probably clinopyroxene).
A.
Trachyandesite of Unit 18 (Sample 183-1139A-71R-1, 0-6 cm).
B.
Trachyte of Unit 19 (Sample 183-1139A-73R-3, 37-39 cm).