Figure 37. Close-up photograph of hand specimen shows fresh to slightly altered dacite recovered from Site 1190 is black, moderately vesicular, and superficially aphyric in hand specimen. However, careful observation and thin section petrography show that the glassy to microcrystalline groundmass contains up to 3 vol% of plagioclase, clinopyroxene, and minor magnetite phenocrysts (interval 193-1190B-2R-1, 28–35 cm).