1869 July 2, H. C. Sorby, “On jargonium: a new elementary substance associated with zirconium”, inThe Chemical News and Journal of Industrial Science[1]:
These various spectra ofjargonium are all of a very marked character, quite unlike those due to any other element in similar conditions.
2014, Marco Fontani,The Lost Elements: The Periodic Table's Shadow Side[2]:
In the same year as thejargonium announcement, 1869, Arthur Herbert Church (1834–1915) announced the discovery of a new element associated with zircon.
2016, A. Meadows,Science and Controversy: A Biography of Sir Norman Lockyer, Founder[3], page59:
Sorby announced, in 1869, the discovery of a new element –Jargonium – by spectroscopic analysis, but was forced in the following year to withdraw his claim as it was found that the interpretation of the spectrum was more complicated than he had supposed.
