Figure F51. Subtype of hyaloclastite consisting of basalt clasts and altered glassy clasts and glassy shards cemented by quartz, carbonate, and sulfide (mineralized volcanic breccia). A. Thin section (Thin Section 80; Sample 309-1256D-122R-1 [Piece 19, 140–143 cm]). B. Spherulitic texture in cryptocrystalline basalt clasts of the hyaloclastite (Thin Section 78; Sample 309-1256D-122R-1 [Piece 16, 119–124 cm]) (plane-polarized light, blue filter; field of view = 5 mm). Light spots are sulfides.
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