Excavate and Identify Gemstones and Minerals. Chip away with the Mallet and dowel on the blocks to reveal Minerals and gemstones in this Smithsonian Rock and Gem Dig Kit! Learn How Rocks and Minerals are Formed. Chip Away to Discover 11 Real Gemstones and Minerals! Includes: 1 Sand Block Containing 11 Real Gemstones, Minerals or Rocks, 1 Mallet, 1 Dowel, 1 Pair of Goggles, 1 Streak Plate, 1 Magnifying Glass, 1 Brush and a Colored Poster with Detailed Instructions. Adultt Supervision Required.