  Some kind of body part. 
This was described as a hip joint part, but it's unlike any of my other hip joints.  It does have a shape that suggest a socket, but I'm not clear exactly how it would fit into a joint assembly.  Maybe someone will enlighten me? 
Source: eBay seller dandn21 
Contributor: Theodore Gray 
Acquired: 5 February, 2005 
Text Updated: 11 March, 2007 
Price: $15 
Size: 2.5" 
Purity: 99.9% 
Sample Group: Medical
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