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Decipium 
Summary
Decipium was the proposed name for a new chemical element isolated by Marc Delafontaine from the mineral samarskite. He published his discovery in 1878 and later published a follow-up paper in 1881.[1][2][3]
Decipium was considered to be in the cerium group of rare earths.[4]
In 1880, spectral analysis proved that decipium had a high samarium content. It is now believed that Delafontaine's decipium sample was a mixture of samarium with traces of other rare earth elements.[5]
References edit
- ^ Delafontaine, Marc (1878). "Sur le décepium, métal nouveau de la samarskite". Journal de pharmacie et de chimie. 28: 540.
- ^ Delafontaine, Marc (1881). "Sur le décipium et le samarium". Comptes rendus hebdomadaires des séances de l'Académie des sciences. 93: 63.
- ^ Delafontaine, Marc (1878). "Sur le décepium, métal nouveau de la samarskite". Comptes rendus hebdomadaires des séances de l'Académie des sciences. 87: 632.
- ^ Harmsworth's Universal Encyclopaedia vol X, 1922 p6493 Rare Earths.
- ^ Marco Fontani; Mariagrazia Costa; Mary Virginia Orna (13 October 2014). The Lost Elements: The Periodic Table's Shadow Side. Oxford University Press. pp. 122–123. ISBN 978-0-19-938334-4.