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Figure F31. Thin section photomicrographs of vesicles. A, B. High-sphericity rounded vesicle in sparsely phyric basalt, peperitic lava flow filled with zeolite (Sample 330-U1373A-9R-1, 17–20 cm; Thin Section 98): (A) plane-polarized light, (B) crossed polars. C, D. Elongate subangular vesicle in aphyric basalt, peperitic lava flow partially filled with zeolite (Sample 330-U1373A-9R-2, 42–43 cm; Thin Section 99): (C) plane-polarized light, (D) crossed polars. E. Elongate subangular vesicle (aphyric basalt) partially filled with zeolite (Sample 330-U1373A-7R-4, 11–13 cm; Thin Section 93; plane-polarized light). F. Vesicle in aphyric peperitic basalt, filled with goethite (Sample 330-U1373A-7R-4, 108–110 cm; Thin Section 95; plane-polarized light).

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