Fig. 20. Undeformed and unreplaced, tiny, island remnant of the original Bonsall tonalite (quartz diorite) in the midst of the granite. Hornblende (olive green, brown); biotite (tan); quartz (white); allanite (orange brown, zoned; three grains); plagioclase (light gray); microcline (dark gray; grid-twinned; outer border of remnant quartz diorite island). Hornblende (green and brown; lower right) partly replaced by quartz (white).