Marc Delafontaine

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.

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Name	Delafontaine, Marc
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Date of birth	1837
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Date of death	1911
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