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Figure F40. Thin section photomicrographs of vesicle infilling material. A. Low-sphericity rounded vesicle in basaltic lava flow filled by carbonate and a few tabular zeolite crystals along the vesicle margin (Sample 330-U1372A-8R-4, 40–43 cm; Thin Section 22; plane-polarized light). B. Vesicle in olivine-phyric basaltic lava flow filled with brown clay, carbonate, zeolites, and iron oxyhydroxides with botryoidal habit (Sample 330-U1372A-11R-1, 61–63 cm; Thin Section 28; plane-polarized light). C, D. Vesicle in olivine-phyric basaltic lava flow filled with carbonate and a minor amount of brown clay (Sample 330-U1372A-11R-1, 84–86 cm; Thin Section 29): (C) plane-polarized light, (D) crossed polars. E, F. Vesicle in aphyric basalt and hyaloclastite breccia filled with carbonate and brown clay showing different stages of radial growth (Sample 330-U1372A-18R-3, 14–16 cm; Thin Section 51): (E) plane-polarized light, (F) crossed polars.

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