Thread: One for the Petrologists
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  #5  
Old 11-05-2011, 02:36 PM
TrevorW
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TrevorW is offline 		 
Join Date: Aug 2006
Location: Western Australia
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Is the dark brown a quartz or lava glass

http://en.wikipedia.org/wiki/Obsidian

or do you think it's a petrified animal
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