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Benson and his colleagues studied samples of both smectite and illite drilled from the ground throughout the caldera.—Rahul Rao, Popular Science, 30 Aug. 2023 Benson and colleagues think that the caldera’s illite formed when lithium-rich fluid, heated by the underlying volcano, washed over smectite.—Rahul Rao, Popular Science, 30 Aug. 2023
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