Figure F30. Thin section photomicrographs of vesicles. A, B. Subelongate, rounded vesicle in aphyric basaltic lava flow filled with fibrous brown clay (Sample 330-U1373A-9R-3, 39–41 cm; Thin Section 102): (A) plane-polarized light, (B) crossed polars. C, D. Vesicle in highly olivine-augite-phyric basalt filled with brown and green clay along the margins and zeolites in interior (Sample 330-U1373A-7R-1, 84–86 cm; Thin Section 89): (C) plane-polarized light, (D) crossed polars. E. Vesicles in highly olivine-augite-phyric basalt filled with botryoidal green and brown clay (Sample 330-U1373A-7R-1, 84–86 cm; Thin Section 89; plane-polarized light). F. Vesicle in sparsely olivine-phyric basalt. The hand sample contained vesicles with a blue coating; the thin section reveals an initial layer of brown clay minerals coated by a thin layer of a translucent mineral; the remainder is void space (Sample 330-U1373A-8R-2, 112–115 cm; Thin Section 97; plane-polarized light).
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