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Retry found a interesting rock yesterday (Pics loaded)
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kornhiller
Posted 9/30/2014 12:34 (#4101133 - in reply to #4100777)
Subject: RE: Retry found a interesting rock yesterday (Pics loaded)


Northeast Iowa
Just a guess here, probably volcanic in origin with different minerals joining that have different melting points, over many millions of years the softer exposed minerals erode away...
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