Figure F10. Digital photomicrograph of a smear slide (plane polar) of volcaniclastic sand with common colorless volcanic glass shards (G), rare crystals of quartz (Qtz), plagioclase (Plag), pyroxene (Pyx), biotite (B), hornblende (H), and planktonic foraminifers (F) (Sample 180-1109C-13H-5, 99 cm).