Have your class look at a granite specimen and describe what they see. They should note three distinct components. Discuss mixtures with them and how they might be separated, then send them to the lab to figure out how to take apart five different mixtures. This terrific lesson can easily be incorporated into either an earth science or a physical science curriculum! Be aware that in order to fully carry out this lesson, you will need to construct a jigger and a buddle; special, yet simple equipment used for separating ores from other materials.