Remark: Yes. I have an almost complete  collection of the chemical elements, i.e.  pure samples (up to 99.99999%) of almost  all elements, including some radioactive  ones like Uranium. And yes, I know, that's  rather geeky. :-)
 
 
 
F
 
 
 
Ca
 
 
 
Tc
 
 
 
Rh
 
 
 
Pd
 
 
 
Pt
 
 
 
Po
 
 
 
Pu
Pitch blende
(Uranium ore)
Nb/Ti alloy
(filaments from CERN)
Iodine in liquid Xenon
(pressure ~70 bar)
liquid CO2
(pressure ~55 bar)
A nerd in Ytterby / S,
mining for Lanthanide ores