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					Originally Posted by  Athanase
					 
				 
				It's clearly Elephant ivory. Very nice patina. 
			
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 Agreed. This is very clearly elephant ivory and the Schreger lines are quite evident. 
As was mentioned earlier in this thread, only elephant ivory displays Schreger lines. 
Technically speaking i don't believe sperm whale tooth is actually consider "ivory", though for general purposes it is often declared as "marine ivory" and displays many of the qualities of ivory.