This is Quartz it is a mineral. It is second only to feldspar as one of the most common minerals in the world.
this is Granite it is an igneous rock. Which means it origin is from the volcanic activity below the earth.
This is Kaolin a sedimentary rock. In rural areas of GA people consume Kaolin as a snack.
This is Gneiss a Metamorphic rock which is the result of sedimentary rocks changing. Gneiss is used to stop water erosion in drainage canals.
