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‎Sur l'ytterbine, nouvelle terre contenue dans la gadolinite.‎

‎(Paris, Gauthier-Villars), 1878. 4to. No wrappers. In: ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome 87, No 17. Pp. (570-) 616. (Entire issue offered). Marignac's paper: pp. 578-581.‎

‎First apperance of the paper relating Marignac's discovery of the rare earth Ytterbium (Ytterbia).""He began his study of the rare earths in 1840, when he was barely twenty-three years old. According to P.T. Cleve, ""Marignac's work on the rare earths is undoubtedly the most importent in this particular department of chemistry"". In 1878 marignac heated some erbium nitrate obtained from gadolinite until it decomposed. When he extracted the resulting mass with water, he obtained two oxides: a red one, for which he retained the name Erbia, and a colorless one, which he named Ytterbia."" (Weeks ""The Discovery of the Elements"").Parkinson ""Breakthroughs"", 1878 C‎