.....and the elements shall melt with fervent heat?
2 Peter 3:12
"Calcium silicate perovskite (CaSiO3)
is arguably the most 
geochemically important phase in the Earth’s lower
mantle, because it concentrates elements that are incompatible in the
upper mantle.
No one has ever successfully retrieved this high-pressure
compound from the lower mantle before. This is because CaSiO3-perovskite
is ‘unquenchable,’ meaning that it cannot retain its structure after
being removed from its high-pressure environment. In a new study, U.S.
geologists have finally found the first calcium silicate perovskite from
Earth’s lower mantle in a diamond from the Orapa kimberlite pipe in
Botswana.
The crystalline compound the researchers found was named 
davemaoite in
honor of the prominent experimental high-pressure geophysicist Ho-kwang
(Dave) Mao and confirmed as a new mineral by the Commission of New
Minerals.
The structural and chemical analysis of davemaoite showed that it is
able to host a wide variety of elements in its structure, including
potassium, thorium and uranium — three of the major heat-producing
elements.
The findings support the existence of compositional heterogeneity
within the lower mantle and, given the mineral’s overall abundance,
suggest that davemaoite likely influences heat generation in the deep
mantle." SciNews