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Learn all about crystal geometry and grow a selection of sparkling crystals with this fabulous Weird Science Set. Follow the easy instructions and watch how › Sodium sulfate forms a white powder or colorless crystals, and displays a very unusual effect when it crystallizes. (More about that later.) › Plaster (Weird science crystal science instructions. Image not available forColor: To view this video download Flash Player In-Store Pickup In the pick-up store is Make crystals that grow and grow with this Weird Science Set.Follow the easy instructions and watch how your crystals transform into symmetrical shapes! When it cools, cavities filled with. Sparkling crystals form. These are geodes. INSTRUCTIONS: HOW TO MAKE A GEODE. 1. Mix a small amount of water in with your