What is this White Thing?

[CraigBrown]

I found this while doing some landscaping, was around a house id date over 150 years old. In Ontario.

 

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[HuntinDog]

Craig,
Much better pictures. Thank you
You should get better answers.
Can you tell what your item is made of??
It looks like ceramic to me.
Is the flat side cut, chipped/broken or cast?
Could be half of a grinding stone.
Good luck hope someone has better ideas for you.

 

[callicles]

Looks a lot like a clay marble to me.

 

[Bruce R]

Grain mill ball.

 

[flinthunter]

What is it made of? If it's stone it could be something called a cone that was made by Native Americans. Cones collection on eBay!

 

[Charlie P. (NY)]

Broken river cobble?

 

[CraigBrown]

Thank you for your inputs, I found out it is a clay marble, I did not think it was clay due to the purity of the white color, but I was wrong. Thank you again Craig...

 

[cudamark]

Wow! that would be a pretty big marble! I never had one that big. I must be fun flicking that thing with your thumb!