Thames & Kosmos - T550022 | Geek & Co. Science: Glowing Crystal Geode Science Kit

Create your own crystal geode - a round rock containing a crystal-filled cavity. First cast a plaster geode shell in the mold and then fill it with a crystal-growing alum salt solution. The crystal solution contains an ultraviolet-luminous pigment that gets incorporated into the crystals as they form resulting in a geode that glows in ultraviolet light. An u...