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Two rocks, lake superior, near Whitefish bay where the edmund fitzgerald sank

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One is an agate. Any idea what the second one is?alt text

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asked Aug 27, 2014 by Weasel (58,930 points)

3 Answers

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They both look like Lake Superior Agate to me. Did you test hardness?

answered Aug 28, 2014 by hershel (52,780 points)
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It is translucent. I thought those were copper inclusions

answered Aug 28, 2014 by Weasel (58,930 points)
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Copper inclusions in Lake Superior Agates are definitely possible - there was an article recently about this in the Rocks and Minerals magazine. Take a look at this article: http://www.rocksandminerals.org/Back%20Issues/2012/July-August%202012/copperbanded_abstract.html

answered Sep 1, 2014 by hershel (52,780 points)

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