Exposing altered mantle rocks to carbon dioxide-rich fluids converts the mineral serpentine to soapstone, a rock made of talc and magnesite. Credit: Jan Helebrant via Wikimedia Commons, CC BY-SA 3.0.

Exposing altered mantle rocks to carbon dioxide-rich fluids converts the mineral serpentine to soapstone, a rock made of talc and magnesite. Credit: Jan Helebrant via Wikimedia Commons, CC BY-SA 3.0.

Exposing altered mantle rocks to carbon dioxide-rich fluids converts the mineral serpentine to soapstone, a rock made of talc and magnesite. Credit: Jan Helebrant via Wikimedia Commons, CC BY-SA 3.0.

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