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Some of these materials are part of a coveted group of rare earth elements (REEs ) located somewhere in the middle of the periodic table. At least 60 types of minerals ― many of them rare earths ― are central to the world’s high-speed circuits. Although not all REEs are scarce, their annual production is relatively low. They have an indispensable role in the high-tech industry because of unique characteristics that make them difficult to substitute.