Figure F42. Photomicrograph of the edge of a xenolith with intergranular texture. Skeletal plagioclase, suggesting a quench texture, is surrounded by intergranular green, highly birefringent material (pyroxene, amphibole, or secondary clay). Fine-grained host volcanic rock is at the upper left (Sample 193-1189B-11R-2 [Piece 8, 89-91 cm] in plane-polarized light; width of view = 2.75 mm. Photomicrograph ID# 1189B_21; thin section 123).