What element is/used to be called Fb? [closed]








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What element used to be called Fb? It was supposedly found in a meteorite in Antarctica and I can't find any references of it. 




Given that *Facebookium* ($\ce{Fb}$) does not exist, it is most likely a typo/transfer error for the first character of the element symbol.


The possible choices are $\ce{Rb}$, $\ce{Pb}$, $\ce{Sb}$, $\ce{Tb}$, and $\ce{Yb}$.


Among these, lead ($\ce{Pb}$) is very likely to be the right one.


In fact, there is a publication in [*Earth and Planetary Science Letters*, **1973**, *20*, 391-394](http://dx.doi.org/10.1016/0012-821X(73)90015-0) where the authors note in the abstract



> 
> In the four meteorites Yamato (a), (b), (c) and (d) recently found in Antarctica, the trace elements W, Re, Os, Ir, Pt, Au, Hg, Tl, Pb, Bi, Th and U were determined by spark source mass spectrometry. The concentrations of these elements were also measured in the meteorites Orgueil (C1), Murray (C2), Allende (C3), Abee (E4), Allegan (H5), Mocs (L6) and Johnstown (Ah). 
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