Little archaeologists will discover quartz, amber, sapphire and more with these fun and interactive Mini Treasures Excavation Dig Kits! Kids can chip away the earthen block to uncover minerals, gems, and stones! Set up an archaeological dig right in your classroom with this amazing science kit for kids. Each kit includes a hidden rock, mineral, or gem in an earthen block with a brush and digging tool. Plastic. Block, approx. 3" x 1 3/4" x 1 1/4".