Clementoni Crystals & Precious Stones Science & Play STEM Set

A large set with all the essentials for creating glittering giant coloured crystals! Precious stones to study and collect: the amethyst, blue agate and lots more are waiting to be discovered! The set includes a special mould to make a fascinating geode that you can enrich with lots of coloured crystals. The detailed scientific manual contains all the secrets behind the formation of crystals and the chemical reactions of salts!