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.
- 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.
- Fontani op. cit. p. 125 says that no documents exist to report his death but it is assumed Delafontaine passed away in 1911.
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