Fig. 15. Border of large megacryst (light gray), showing relationships to groundmass minerals (right side). The orthoclase projects into and around granulated minerals smaller in size than in the adjacent coarser-grained groundmass. Many plagioclase inclusions in the orthoclase have scalloped borders. Five elongate plagioclase crystals (gray, white, black) in the groundmass have crystallized against each other in parallel alignment (synneusis) and are parallel to the zoning in the megacryst. Other crystals in the groundmass also show the same parallel alignments, but some are disoriented or at right angles (black).