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. Our Purple kit comes with amethyst, glow in the dark green with fluorite, blue with calcite, and red with aragonite. Learn all about these extraordinary crystals with our teacher-written adventure guide.