Figure 19. Close-up of the edge of the pegmatite shown in Figure 18. Notice that the minerals of the pegmatite and the fine-grained granite are intergrown along the contact. Also, a small patch of pegmatite is surrounded by fine-grained granite. Together these observations suggest that the fine-grained granite had not completely solidified when the pegmatite intruded.
Last updated on August 18, 2010