Culuminating activity at the end of a geosphere unit -- students choose 5 out of 41 possible choices covering topics such as: Layers of the Earth ~ Plate Tectonics ~ Rock Cycle ~ Earthquakes ~ Volcanoes. This project could easily be converted to ANY SCIENCE TOPIC, not just geosphere.
Rocks and Minerals - Interactive Learning Sites for Education
Pegmatite is very crystalline, an intrusive igneous rock composed of interlocking crystals usually larger than 2.5 cm; such rocks are referred to as pegmatic. Most pegmatites are composed of quartz/ feldspar/ mica; e.g. granite.