Fig. 7. Partial replacement of zoned plagioclase (white) along border of microcline megacryst (black). Microcline forms wedges and narrow veins that penetrate the plagioclase. Myrmekite with tiny quartz vermicules (nearly invisible) occurs on border of one of the plagioclase crystals. Remnant islands of plagioclase in the microcline occur in parallel optical continuity with an adjacent larger plagioclase grain.