CaSi-perovskite CaSiO3 (CaSiPrv) is stable within the pressure
range from almost 100 GPa to 14–16 GPa (Shim et al., 2000), i.e., from the lower parts of the lower mantle up to the transition zone.
Following its release from diamond, CaSiPrv acquires a retrograde
structure, that of larnite or walstromite