Open main menu

Marc Delafontaine

Marc Delafontaine (Born at Céligny, March 31, 1837/1838[a]–1911[b]) was a Swiss chemist who in 1878, along with Jacques-Louis Soret, first observed holmium spectroscopically. In 1879, Per Teodor Cleve chemically separated it from thulium and erbium. The three are given credit for the element's discovery.[1]


  1. ^ Fontani, Marco; Costa, Mariagrazia; Orna, Mary Virginia (2014). The Lost Elements: The Periodic Table’s Shadow Side. Oxford University Press. p. 119–125. ISBN 9780199383344.


  1. ^ Fontani op. cit. p. 125 states that Poggendorff's Biographisch-Literarisches Handwörterbuch, Verlag von Johan Ambrosius Barth, Leipzig, 1898, p. 344 gives his birthyear as 1838, while Mary Elvira Weeks Discovery of the Elements, 7. ed., Journal of Chemical Education: Easton, Pennsylvania, 1968, p. 677 says it is 1837.
  2. ^ Fontani op. cit. p. 125 says that no documents exist to report his death but it is assumed Delafontaine passed away in 1911.