National Geographic Premium Polished Stones - 15 Pounds of 3/4-Inch Tumbled Stones and Crystals Bulk opens up a world of geological wonders right at home! As educators and parents, we know the thrill of discovering the hidden beauty in nature, and this kit offers the perfect blend of play and learning. From examining the unique patterns of agate to the shimmering allure of amethyst, children can develop critical thinking skills while engaging in hands-on exploration. 5+ years