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Posted in response to Obsidian in Central New York State? from Jud on December 27, 2009 at 11:42:48:
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Odd composition for obsidian, usually very similar to granite or rhyolite. The missing Al, Na, and K make me wonder if this might be glass or slag. What's the local geology?
From MikeR - December 29, 2009 at 09:05:44
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