Figure F13. Section 185-801C-15R-7 showing extreme alteration types observed. The pale green alteration flanks an interpillow sediment. The gray-green alteration at the bottom of the core is typical of much of the background alteration in the cores. Proportions of the main secondary minerals are given, as are photomicrographs in which saponite, smectite, and calcite are visible. The two photomicrographs of the pale green alteration show a plagioclase phenocryst, which is otherwise rare in these dominantly aphyric lavas.