Fig. 20. Aggregate mass of plagioclase crystals that have crystallized with their longer dimensions parallel to each other. The aggregate occurs at an inner corner of the orthoclase megacryst (black). Tiny plagioclase inclusions extend in parallel layers on the right side and then change direction to become parallel to the lower edge of the aggregate (bottom left of photo). One inclusion is strongly normally-zoned. Some layers contain stringers of tiny plagioclase fragments and quartz ovals.