Figure F17. Photomicrograph of rare fresh glass fragment occurring in interpillow hyaloclastite amid otherwise completely altered glass, igneous minerals, and secondary material. Glass fragment with palagonite rim (orange) with very elongate acicular plagioclase crystals and a saponite pseudomorph after an equant olivine microphenocryst enclosing Cr spinel (Thin Section 28; Sample 324-U1346A-8R-1, 56–60 cm). Transmitted light.
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