Facts
This Rare-Earth-Element belongs to the group of lanthanoids. It not known to have a biological role in organisms, and is not very toxic either. Intravenous injection of rare earths into animals has been known to impair liver function, but the main side effects from inhalation of rare-earth oxides in humans come from radioactive thorium and uranium impurities.
In combination with neodymium, another rare-earth element, is praseodymium used to create high-power magnets notable for their strength and durability. In general, most alloys of the cerium-group rare earths (lanthanum through samarium) give extremely stable magnets that are often used in small equipment, such as motors, printers, watches, headphones, loudspeakers, and magnetic storage. Praseodymium is also used for studio and projector lights. Praseodymium compounds give glasses, enamels and ceramics a yellow color.
McGill, Ian. "Rare Earth Elements". Ullmann's Encyclopedia of Industrial Chemistry. Vol. 31. Weinheim: Wiley-VCH. p. 183–227