  Purple gold. 
Purple gold is a strange thing indeed.  It is composed of gold and aluminum, but it's not an alloy.  It is instead a compound of definite proportions.  Known as an intermetallic compound, the bond between gold and aluminum atoms is weakly ionic. 
Source: Max Whitby of RGB 
Contributor: Max Whitby of RGB 
Acquired: 24 March, 2009 
Text Updated: 24 March, 2009 
Price: Donated 
Size: 0.25" 
Purity: 90%
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