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The 'Ringwoodite' Gemstone Reveals Ocean Beneath Planet Earth

 - Mar 18, 2014
References: theregister & motherboard.vice
Diamond expert Graham Pearson of the University of Alberta discovered a rare ocean-uncovering stone. The seemingly worthless, 3-millimeter piece of brown diamond was found in Mato Grosso, Brazil.

Within the stone, Pearson and his team found ringwoodite--created when olivine is highly pressurized. It's been previously seen within meteorites and can be created in a laboratory. It has never been found in a sample of the Earth's mantle--until now.
The stone was found to contain trapped water that made up roughly 1.5 percent of the ringwoodite's weight. Using analyses of its depth and water makeup, Pearson suggests there is water deep beyond the Earth's surface; an immense amount of it.

The finding "confirms predictions from high-pressure laboratory experiments that a water reservoir comparable in size to all the oceans combined is hidden deep in Earth’s mantle," and truly brings into question what lies beneath our planet as we know it.