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Top: lane light view of quartz with melt inclusions from a 0.5 Ma high-SiO2 rhyolite from Kos Island in the Aegean Arc (C. Schnyder & O. Bachmann); crystals are ca. 3 mm across. Right: Nomarski (NDIC) image of plagioclase phenocryst and groundmass from 1985 lava flow of Arenal volcano, Costa Rica; phenocryst is 300 m in length (M. Streck). Bottom: Crossed polars image of reversely zoned clinopyroxene in high-Mg andesite from Whaleback volcano, near Mt. Shasta, CA; image diameter ca. 2 mm (M. Streck). Left: BSE image of zoned feldspar from Mt. St. Helens, Kalama age (A. Lieuallen & F. Tepley). Far left: Mt. St. Helens, WA (J. Rosso).