Encourage your little geologist with this collection of 16 common rocks and minerals on a 4x6" inch card. Facts about the rocks and minerals are printed on the back of the card. Part of Copernicus Toys Compact Curiosities line -- small packages full of big wonders. Great little collectible science toys and STEM demonstration items. Perfect for birthday gift bags, stocking stuffers, and Easter baskets--or any time you need a little science. Spark curiosity for collectors of science and nature We recommend Compact Curiosities for a wide range of retail settings including toy stores, gift stores, children's museums, science museums