Praseodymium and neodymium

Didymium was found to be a mixture of two rare earth elements, which were separated and named praseodymium and neodymium. This discovery allowed for further scientific understanding and advancements in the study of rare earth elements.
 Carl Auer, Freiherr von Welsbach Austria 1885 Praseodymium and neodymium

Didymium was found to be a mixture of two rare earth elements, which were separated and named praseodymium and neodymium. This discovery allowed for further scientific understanding and advancements in the study of rare earth elements.