All the cultural broadening one gains in Duolingo! Apparently the original tungsten was a tungsten ore, calcium tungstate, now officially called scheelite for the Swedish discoverer Carl Wilhelm Scheele, but still called tungsten by many Swedes. So Volfram is now used to disambiguate the element from the ore. Scheele would apparently have been a more well-known chemist if others hadn't been credited with half a dozen other elements besides tungsten which Scheele actually discovered first. At least that is what Wikipedia would suggest.
So many comments. Let me add one more. Being German and taking this Swedish-English course I often find it amusing that quite often Swedish words are closer to German words and very different from English, mostly those of French Norman origins (amusing, the frenchized Normans, men from Wiking land). In German a heavy tungt book and a difficult svart book are the same, ein schweres Buch. I could add hundratals of more such comments, not just the ever appearing turtles skjöldpaddorna, Schildkröten. Btw, I really miss word lists. Tack tack