Drusy, or Druzy, a glittering stone, by any other name, would sparkle as sweetly ... with apologies to Billy Shakespeare, but no matter how you spell it - this stuff is fabulous. Mostly Quartz Drusy or Chalcedony - these are the exquisite crystals that form inside pockets and hollows in the stone. Some of these are coated with metallic layers to give them a richer colour.