Keywords: Galissard de Marignac.jpg Jean Charles Galissard de Marignac 1817 “1894 Swiss chemist who discoverered ytterbium in 1878 and codiscovered gadolinium in 1880 http //www annales org/archives/x/galissard html Ecole Nationale SupĂ©rieure des Mines de Paris ~ 1850 author Author died more than 70 years ago - public domain PD-old Jean Charles Galissard de Marignac |