Im sure its common but can any say what it is?

[fuss]

Im sure its common but can anyone say what it is?

found along the beach on a medium size lake in northern WI. It is in between dime and nickel in size. Thx.

 

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[rebbel31]

Probably a rotting crusty zincoln

 

[Clay Diggins]

It's Grabbo or possibly Diorite.

 

[fuss]

Thank you.