Word: praseodymium
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...commercial metals are so scarce as a group of 15 known as the "rare earths." They are so rare, in fact, that there is some question as to whether one of them exists at all. They have tongue-twisting names (praseodymium, gadolinium, cerium, lanthanum, ytterbium, etc.), are found in rare mineral deposits, mostly in India and Brazil. Until recently, the metals had limited uses...
...hypothetical count. He had them all assembled in the university's rare earths laboratory, and his procedure was to isolate them one by one, scrutinize them closely, and put them to one side positively identified as Oxygen, Gold, Barium, Chlorine, etc., etc.-old friends-or as Ytterbium, Lutecium, Praseodymium, etc., etc.-individuals that are rarely seen and have been introduced to science comparatively recently...
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