Figure F25. Photomicrograph of melt inclusions (small equant dark regions within larger crystal) in plagioclase phenocrysts from a glassy lobe margin in Unit 3 (Sample 197-1203A-19R-2 [Piece 3, 24-26 cm]) (plane-polarized light; field of view = 1.25 mm; photomicrograph 1203A-55).