Marc Delafontaine (Born at Celigny, 1837–1911) 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.
This page was last edited on 29 December 2018, at 14:30 (UTC).