What specific mineral is responsible for structurally holding this immense quantity of water deep within the Earth?

Answer

Ringwoodite

The water is held within the crystal structure of the rare mineral called ringwoodite, which forms under the extreme temperature and pressure conditions found deep in the mantle. Ringwoodite acts like a sponge by attracting and trapping hydrogen.

What specific mineral is responsible for structurally holding this immense quantity of water deep within the Earth?
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