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Researchers Have Found The First Direct Evidence Of A Never Before Seen Mineral That Forms In The Mantle. The Mineral, Davemaoite, Is Said To Be A High Pressure-Temperature Form Of Wollastonite, A Commonly Found Mineral. The Davemaoite Was Discovered, Using Synchrotron X-ray Diffraction, In A Botswana Diamond, Which Formed In The mantle.

https://www.smithsonianmag.com/smart-news/scientists-identify-a-never-before-seen-mineral-from-deep-within-the-earth-180979068/

Scientists previously synthesized the mineral in a lab using immense amounts of pressure, but they were surprised to find it in nature