Fig. 19. Large zoned plagioclase (light gray) with sericitized central core (right side, brownish). Island remnants of the outer broad rim of the plagioclase occurs in perthitic K-feldspar (black). Elongate oval area (white) enclosed by K-feldspar (left of large plagioclase crystal) is myrmekite; see Fig. 21. Hornblende (brown, lower left). Ratagain pluton.