Small crystal,  99.999%. 
Kindly donated by David Franco, who sent many elements after seeing the slashdot discussion, and this one after I sent him some Mathematica t-shirts.   
This is a very fine shiny and very pure crystal.  
Source: David Franco 
Contributor: David Franco 
Acquired: 11 June, 2002 
Price: Donated 
Size: 0.2" 
Purity: 99.999%
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