Tellef Dahll (10 April 1825, in Kragerø – 17 June 1893, in Morgedal) was a Norwegian mineralogist and geologist.Tellef Dahll Norsk Biografisk Leksikon. Retrieved 1 October 2015. (Norwegian)
Life After graduating in mineralogy from the University of Christiania in 1846, Dahll worked for private mining companies. He found coal on the island of Andøya, iron ore at BjørnevatnWho We Are Sydvaranger Gruve AS. Retrieved 1 October 2015. and in 1867 Dahll discovered gold from the Tana and Anarjohka rivers, which launched the 1870 gold rush in the Finnish Lapland.Derek Maier, Wolfgang & Lahtinen, Raimo & O'Brien, Hugh: ″Mineral Deposits of Finland″, p. 7–8. Elsevier, 2015. . Google Books Since 1858 Dahll and Theodor Kjerulf led the first geological survey of Norway.Fontani, Marco & Costa, Mariagrazia & Oma, Mary Virginia: ″The Lost Elements: The Periodic Table's Shadow Side″, p. 136. Oxford University Press, 2014. . Google Books
In 1879 Dahll collected samples of nickel arsenide and gersdorffite on the island of Oterøya in his birthplace Kragerø. Dahll found out that the rocks contained previously unknown element which he named Norwegium.Hafnium Elementymology & Elements Multidict. Retrieved 1 October 2015. The phosphate mineral dahllite (hydroxylapatite) is named after Tellef Dahll and his brother, the mineralogist Johann Dahll.Dahllite Medical Definition Merriam-Webster Medical Dictionary. Retrieved 1 October 2015.
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