Any Ideas! ?

[TJE]

This stone should have been under about 3-4 feet of water, found on the sandy shores of Lake Huron...(that's how low Huron has dropped)!!
Any ideas folks?

 

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[rock]

No but when you post you should show something with it for size and tell the state or where it was found.

 

[Eu_citzen]

Porphyry, I think.