Druzy Quartz refers to a layer of minute quartz crystals that have crystallized on the surface of a quartz based mineral. Druzy Quartz has a sugar-like appearance. They are often found in the hollow cavity of Agate geodes. Druzy is a naturally occurring process and happens when the water brings minerals to a rock's surface, and then the water evaporates. During this process, cooling occurs, and the minerals are left behind to form crystals on top of the rock.