A different surprise lies inside each of these clay stones just waiting to be discovered. Simply chisel away the stone to excavate petrified wood fool's gold amethyst snowflake obsidian and 8 other minerals and fossils. Set includes one dozen individually wrapped clay stones each with a chiseling tool and instructions—it's a perfect activity for groups or parties! Identify and learn about your geologic discoveries with the accompanying Field Guide to Fossils and Minerals.
