> No one has ever successfully retrieved a high-pressure calcium silicate from the lower mantle before. This is because the high-pressure CaSiO3-perovskite is “unquenchable,” meaning that it cannot retain its structure after being removed from its high-pressure environment.

> “When we broke open the diamond, the davemaoite stayed intact for about a second, then we saw it expand and bulge under the microscope and basically turn into glass,” says Tschauner.

Science paper (paywalled): https://www.science.org/doi/10.1126/science.abm4742