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If you thought Cadbury Creme Eggs were humanity’s greatest confectionery creation, Alex O’Brien Yeatts, a baking and pastry student at the Culinary Institute of America, has come up with a dessert that looks straight out of a geology textbook—not a cookbook.

Working with cake decorator Abby Lee Wilcox, Yeatts created what looks like a massive boulder. When cracked open, it’s filled with crystal-like geodes, making it look like a valuable chuck of amethyst. However, the entire thing is actually made from chocolate and sugar, and is completely edible—if you want a sugar high that will last until Christmas.