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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.republicworld.com/technology-news/science/never-seen-before-mineral-found-in-diamond-hauled-from-deep-inside-earths-mantle.html

In a major discovery, mineralogists identified a new mineral in a diamond mined from about 410 miles (660 km) below the surface of the earth in Botswana.