Troll's best-selling book-and-merchandise packages make learning fun.

Experiments and problems to be done by the non-specialist to aid in his understanding of crystals.

Ideal for today's young investigative reader, each A True Book includes lively sidebars, a glossary and index, plus a comprehensive "To Find Out More" section l

This "unicorn of the sea" will shimmer with a crystal spout, horn, and tail. Create a sparkly, crystal-covered friend. Choose from a unicorn, narwhal, dragon, f

Explore the science of gems and minerals while crafting 7 dazzling, crystal projects in your choice of colors. With this kit, a stylish scientist can make 3 pen