Druzy Quartz (also spelt as Drusy or Druse) is a thin layer of quartz crystals covering the surface of a host stone. One good example of Druzy is the crystals filled inside the cavity of a geode. It is well known that amethyst or citrine get the source of their color from this quartz crystal but usually Druzy Quartz takes the host stone's color which is seen through it as in chrysocolla or uvarovite garnet.
The term "Druzy" refers to the tiny crystal which is formed within of on another stone in a large number. When the ground water that carries dissolved silica is forced to to get filled into a porous area of rock, rapid cooling occurs and it causes the formation of minute crystals. As in Druzy Chrysocolla, the rock is composed of agatized chysocolla with crusts of small sparkling quartz crystals in tiny cavities.
Druzy Quarts is said to aid in balancing and increasing energy. Since ages it has been used to diagnose disease and is believed to enhance natural extrasensory perception abilities.