Fig. 2From: Mineralogical study on volcanic ash of the eruption on September 27, 2014 at Ontake volcano, central Japan: correlation with porphyry copper systemsPhotographs of ash particles from the September 27, 2014 eruption. a Opaque white-colored grains, b opaque gray-colored grains, c translucent brownish gray-colored grains, d transparent grains, e translucent white-colored grains, and f free crystals of pyriteBack to article page