Rare Earths
In 1885 von Welsbach used a method he developed himself to separate didymium for the first time. He saw several different colored versions which he named "praseodymium" (green) and "neodidymium" (pink); the latter then became the more common name for the element, neodymium.
Read more about this topic: Carl Auer Von Welsbach
Famous quotes containing the word rare:
“I’ve always been impressed by the different paths babies take in their physical development on the way to walking. It’s rare to see a behavior that starts out with such wide natural variation, yet becomes so uniform after only a few months.”
—Lawrence Kutner (20th century)