Figure 39. Photograph of fresh (interval 193-1191A-1R-1, 9.5–11.5 cm) to slightly altered (interval 193-1191A-1R-1, 12–18.5 cm) aphyric rhyodacite from the top part of Hole 1191A. The main stretching orientation of the vesicles is normal to the surface of the sample (interval 193 1191A-1R-1, 9–19 cm).