Fig. 10. Cataclastically-broken felsic diorite, in transitional rock between unaltered, undeformed, felsic diorite (Fig. 4 and megacrystal quartz monzonite (like that shown in Figs. 3 and 4). This photomicrograph was taken from a sample 10 m along strike from Fig. 4. Image shows a tiny portion of a less than 1-cm-long microcline crystal in earliest stage of becoming a megacryst (3 to 4 cm long). Microcline (dark gray; top and left) encloses, penetrates in veins, and replaces plagioclase (cream-gray, light gray). Large plagioclase islands are optically continuous with adjacent tiny islands (blebs) of plagioclase in microcline. Large plagioclase islands are locally myrmekitic, containing elongate-oval cross-sections of quartz vermicules (black to gray). Tiny biotite crystals (light tan) are poikilitically enclosed in plagioclase (bottom). (Photo magnification is 52.5x).