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Text Description: Second lithology within basalt hyaloclastite. Augite, plagioclase, and olivine phenocrysts in a very vesicular groundmass of the same mineral composition as Au-112a. Pyroxene textures are the same as in Au-112a and olivine is less euhedral. References:  Petrology, geochemistry, and the evolution of magmas from Augustine Volcano, Alaska |
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