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Crystal Meth: “If you give a chimp a crystal, she might not give it back. Researchers learned this the hard way. They gave quartz, calcite and other types of crystals to chimpanzees in a rehabilitation center. The apes responded with great interest, and the researchers ended up needing to trade large amounts of bananas and yogurt to get back the largest crystal. Others were never retrieved.” Chimpanzees Are Really Into Crystals.