Rare Earth Oxides (IMAGE) Rutgers University Caption These are rare earth oxides of gadolinium, praseodymium, cerium, samarium, lanthanum and neodymium. Credit USDA ARS Usage Restrictions None 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.