Hydrogen ions move freely within the crystal structure of a hydrous mineral under lower mantle conditions, resulting in high electrical conductivity that may make it possible to map water in the deep mantle.
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Komabayashi, T. Hydrogen dances in the deep mantle. Nat. Geosci. 14, 116–117 (2021). https://doi.org/10.1038/s41561-021-00704-5
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