  Torn lump. 
American Elements is a chemical supplier with a wonderfully refreshing attitude towards element collectors: They actually like small orders from people looking for exotic elements (with reason).  They also sell quite a variety of compounds, particularly rare earth salts, many of which are highly colored. 
This lump of yttrium is typical of the metal, showing what appears to be a torn polycrystalline surface.  My guess is they chop up slabs of the stuff with big sheers.  In any case, it makes for a lovely, very photogenic texture: Check out the 3D rotation video. 
Source: American Elements 
Contributor: American Elements 
Acquired: 2 June, 2006 
Text Updated: 11 August, 2007 
Price: Donated 
Size: 1" 
Purity: 99%
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