Plate 4. Selected key textural relationships in the pelitic and migmatite gneiss. 1. Leucosome domain of a migmatite gneiss formed by cordierite (Cd) interfingered with K-feldspar (K), plagioclase, biotite (b), and quartz. Sample 161-976B-98R-1, 96-101 cm. Plane-polarized light. Scale bar is 500 µm.