Lower Mantle Minerals (IMAGE) Ehime University Caption Crystal structures of major mineral phases composing the Earth's deep mantle, (Mg,Fe)SiO3 bridgmanite (Brg), its high-pressure phase post-perovskite (PPv), CaSiO3 perovskite, and (Mg,Fe)O ferropericlase Credit Ehime University Usage Restrictions Please get copyright permission License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.