Special Properties Rock Collection
Like early humans, your children will discover that rocks can be useful! This set includes: pumice (the rock that floats), optical calcite (look through it to see a double image), and magnetite (naturally magnetic). Description cards outline historical use and properties of each. Ages 6 and up.
Free Regular Shipping on Orders of $50 or more (merchandise total). Valid to all U.S. destinations. Not valid for drop-ship items. To redeem, enter FREE SHIP 50 in the coupon code box during checkout. Offer ends 3/31/2016.