Check the listing for details. BBC Earth 3D Asteroid Crystal Cavern Grow & Observe Crystals. Condition: New, Made in China. Listed at 10.00 USD. The BBC Earth 3D Asteroid Crystal Cavern is an educational science toy from Horizon Group USA, released in 2008. This unique product allows children aged 8 and above to grow and observe crystals in a 3D asteroid cavity, providing hands-on learning opportunities in the realms of science and nature. Created in China, this toy is designed to spark curiosity and fascination with the world of crystals and geological formations, making it a great addition to any young enthusiast's collection. New in box no returns