These crystal-growing experiments take some time, but your patience will be worth it. Learn all about crystal formations and watch the crystals grow day by day. Conduct a crystal-growing experiment today. These kits include a real crystal specimen to add to your collection. Kits include either purple amethyst, glow-in-the- dark green fluorite, blue calcite or red aragonite. Learn all about these extraordinary crystals with our teacher-written adventure guide.