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Interesting Agate? - found on Mackinac Island, MI?? Help!

by Karen R
(Chesterfield, MI)

I found this rock on the northern shores of Mackinac Island last weekend along with some gorgeous banded chert/flint. It caught my eye immediately. Is this some sort of agate? I found it very unusual. Thanks for any input!

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Sep 20, 2020
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by: Douglas

It does look like agate, though some of those markings look almost like fossils. Not likely if it is agate. Agate would be a 7 on the mohs scale if you do a scratch test. See below:
https://www.rocksandminerals4u.com/properties_of_minerals.html

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