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					Originally Posted by Rick
					
				 
				This is a petrified material; is it not ?    
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*Sorry, I missed Alan's post on this .     
Wouldn't the color be determined by the mineral content of the strata it was buried in ?  
			
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 Yes Rick,
it's like you write, the minerals in the ground give the different colours.
Here again my molar hilt.
Regards,
sajen