Need help identifying white roundish stone

[rowsley]

I find this in a field by our house in canton, ohio. It's about the size of a cue ball. Not completely round, but roundish. Seems to have black ding marks on it but the whole thing is perfectly smooth and has a decent weight to it. Anyone have any ideas what it could be?

Thanks in advance

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[duggap]

Well if you had found it at an old farm house I would say it is an old laying egg, used to get the hens to start laying.

 

[rowsley]

Thanks for the input. I mean could possibly be. I was thinking something native like hammer stone but I honestly have no clue. Ill see if anyone else has anything to say. Thanks again.

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[taz42o]

Thats a pottery mill ball , used to grind clay at pottery.

 

[SkySgt]

Maybe one of these?

France circa 1850 stone balls (AZ26)

http://leestantonblog.files.wordpress.com/2013/01/az26.jpg

 

[tamrock]

I think its a natural rock. In Wyoming the Green River has all kinds of river rock polished to a smooth luster just the same. I would expect to see more inline striation marks on it to be considered a stone tool. I'm going to Wyoming next week. I'll pick up a few stones out of the river to show when I get up there. But I could be wrong? Taz42o may have it as he's from the clay country and land of the pottery makers. I can see a rock getting a nice finish in that way.