Fig. 3.

250–500 μm fraction of May 27, 2010 ash (collected at Site No. 5; Fig. 1 and Table 1). For definition of each ash component, see Subsection 5.1.1. All photographs were taken under binocular microscope at the same magnification. “Partly altered pumice” particles having pale-yellow color are not juvenile. In “scoria”, only “fresh” ones can be recognized as juvenile. A higher magnification photograph of the “fresh scoria” is shown in Fig. 4. “Partly altered lava” particles (accessory) are less altered and more angular in comparison with “altered material”. In “altered material”, white-colored particles were probably generated by silicification and are charged with small sulfides (red arrow). Orthopyroxene, clinopyroxene and plagioclase are recognized as the “free-crystal” component. Color version available online.