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			Sorry, GOB, but none of my sources are very specific as to what type of steel it is that they used.  About the best reference I could find was from the following: 
 
"A piece of flint, iron pyrite, quartz, or jasper produces sparks when struck with hardened iron steel.  An old file, broken off to a length of about 4-5 inches, works well." (from Indian Handcrafts, by C. Keith Wilbur, M.D. 
 
I would assume that this is high carbon steel, but just a guess on my part.  I'll keep looking......
		 
		
		
		
		
		
		
			
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