Post-perovskite (IMAGE) Yale University Caption This X-ray diffraction image of a small sample of post-perovskite, which exists deep in the Earth's interior, was taken while the mineral was being compressed to pressures more than one million times atmospheric pressure. Credit Lowell Miyagi/Yale University Usage Restrictions with credit 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.