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Posted in response to Lake Superior stones from Paxie P on October 16, 2009 at 09:18:44:

Re: Lake Superior stones

Paxie, I have always called this porphyry. I seem to find it a fairly common mixture of igneous matrix and quartz crystals.

From Don L. - October 17, 2009 at 11:19:45

Message: 68436


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