The National Geographic Treasure Mini Dig Kit makes geology surprising and fun! That’s because you won’t know if a pyrite, aragonite, or tiger’s eye specimen is inside until you dig! Use the included dig tool and brush to excavate, then learn about your new treasure in our full-color learning guide. Geology-based activity set. Treasure chest-shaped dig brick contains either a pyrite specimen, aragonite, or tiger’s eye gemstone. Every dig is a surprise!