This article does not cite any sources. (December 2009) (Learn how and when to remove this template message)
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 article about a Swiss scientist is a stub. You can help Wikipedia by expanding it.|
|This biographical article about a chemist is a stub. You can help Wikipedia by expanding it.|