Fig. 19. Microcline projects into a crack in a bordering plagioclase grain (upper left; cream-white). Remnant plagioclase grains occur with parallel alignment. One remnant plagioclase grain (lower right side) has a long tail (lower left corner of plagiolase island) that would not be characteristic of a sub- or euhedral plagioclase crystal that had formed prior to the crystallization of a K-feldspar (orthoclase) crystal from a melt and which would grow around earlier-formed plagioclase crystals. Such a tail would not exist.