Figure F39. Photomicrograph of a glomerophyric cluster of phenocrysts (here, plagioclase, clinopyroxene, and magnetite) and a nearby microvesicle, which are a common feature of Unit 1. Interstitial spaces around these aggregates typically consist of microlite-free volcanic glass (Section 193-1190B-2R-1 [Piece 7, 40-43 cm]; width of view = ~1.38 mm. Photomicrograph ID# 1190B

Figure F39. Photomicrograph of a glomerophyric cluster of phenocrysts (here, plagioclase, clinopyroxene, and magnetite) and a nearby microvesicle, which are a common feature of Unit 1. Interstitial spaces around these aggregates typically consist of microlite-free volcanic glass (Section 193-1190B-2R-1 [Piece 7, 40-43 cm]; width of view = ~1.38 mm. Photomicrograph ID# 1190B_01, thin section 44).