Agates

       The copper replacement agates, reportedly fist discovered in 1951 by John and Frank Perona, got their first name from on of the first theories of their formation, which stated that copper seeped into and replaced certain agate bands.  They are only found in mine dumps or piles of unwanted rock left over from Michigans copper mining era.

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Learn more from the Agates of Lake Superior book by Bob and Dan Lynch.  Available in many rock shops and book stores.

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