Figure 5. This image highlights the large mica crystals that are common in pegmatites. In the center of the image is a mica crystal, about ¾ inch across, with its flat face toward the camera. Just to the left of that is another crystal seen on edge, showing the strong cleavage that allows crystals to be peeled down to very thin layers - always a hit with kids!
Last updated on January 6, 2012