Figure F102. Hyaloclastite breccia containing rare plagioclase phenocryst replaced by albite and microfractures filled with pyrite and chalcedony (Thin Section 76; Sample 309-1256D-122R-1, 35–38 cm) (field of view = 4 cm × 2.4 cm; plane-polarized light). Cement is composed of quartz, pyrite, chlorite-smectite, and calcite.
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