Huge Marble I Found - ??

[Ripcon]

I found this stoneware marble today at a Louisiana plantation site. It's huge. It is broken in two, but it measures 1.5'' in diameter. I've never seen a marble this big. Can anyone give me any information on the age or why this marble is so big? Thanks for any assistance.

 

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[cheese]

Might be a mill ball.

 

[Ripcon]

Might be a mill ball.

Thanks, Cheese.