"Grow two massive crystals with the National Geographic Giant Crystal Growing Lab! These crystals are three-times larger than our standard crystals and grow fully in just a few days. Your kids will be astounded as they watch these crystals take shape and will learn the science behind crystal formation in our detailed full-color learning guide. This kit also includes a magnifying glass and real crystal specimen. • Everything you need to grow a giant blue and purple crystal • Simply mix crystal-growing powder with hot water add the seed rock and watch as your crystals grow in just a few days • A detailed learning guide provides insight into the science of crystal growth • A real crystal specimen is included