Fig. 13. Left side. Microcline (light gray; large grain in left half) surrounded by granules of plagioclase with speckled appearance. Right side. This image is from the same thin section and adjacent to the image on the left, but the image is diagonally offset downward to the right to show a different optic orientation. Microcline (black) in the right image is the same as microcline (dark gray) in the left image. Note that plagioclase grains in the right image have been broken into an aggregate of speckled grains. In the upper part of the dark gray and black microcline grain is an isolated grain that is in the process of recrystallizing to become myrmekite with quartz vermicules. In the far lower left side of the light gray microcline (left side) are two myrmekite grains (white, projecting into the microcline) that are farther along in their recrystallization and have lost their speckled appearance. The quartz vermicules (dark gray) are very narrow and not well developed. Speckled grains have reversed zoning with cores as low as An₅ and rims An_17-18. See Fig. 3 in Collins (1997b).