| Cube under oil. This is a substantial cube of a relatively reactive rare earth (hence the "under oil" part).
 
 I chose this sample to represent its element in my Photographic Periodic Table Poster.  The sample photograph includes text exactly as it appears in the poster, which you are encouraged to buy a copy of.
 
  
 Source: David Franco
 Contributor: Ed Pegg Jr
 Acquired: 16 August, 2002
 Text Updated: 4 May, 2007
 Price: $43
 Size: 0.4"
 Purity: 99.99%
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