A rare diamond from Brazil has revealed evidence of a possible pathway carrying water into Earth’s deep mantle. These minerals commonly form near Earth’s surface in soils and ocean environments, making their discovery inside a deep diamond unexpected. X-ray fluorescence analysis and 3D reconstruction of the mineral inclusion trapped inside diamond J1. Juína Diamonds Continue To Reveal Earth’s Hidden ProcessesThe new discovery adds another chapter to the scientific importance of Juína diamonds. The identification of goethite inside a super-deep diamond provides another possible mechanism for transporting water into regions where scientists once believed storage capacity was extremely limited.