Use the 27 real stones provided to help you become a crystals and precious stones expert. Carry out experiments to discover their properties. Use the tools to unearth 8 real stones. Find polished versions of them in the bag (300 g) and compare them with the magnifying glass. Grow giant crystals and instant crystals. Study a wide variety of amazing rocks: volcanic stones, quartz, fool’s gold, fluorescent rock, polished agate, bismuth crystal, and more. Requires 3 LR41 (AG13) batteries, included. 8+ years