Nice Grinder

[quito]

Acquired this piece yesterday at a N. Dak. Auction.
Nice material, form, and size on this one.

 

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[kingskid1611]

Colorado river rock?

 

[quito]

Colorado river rock?

Probably a field stone, something left behind by the glaciers.

 

[chase2]

Looks like a type of granite. and yes Colorado does have that type. Nice N. Dak accusation