River cobble?

[Bbmbr]

Found in Tuolumne County California. A friend found this and then out it in her yard so it has some calcium build up from the sprinklers. Looking for opinions on wether it could be a pestle.

 

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[Charlie P. (NY)]

I guess it would work for one. Don't know how you'd demonstrate it was used as a pestle.

I imagine the end would be more "regular" if it pounded in a circular hollow mortar for any time.

 

[Back-of-the-boat]

Very good possibility.

 

[Rookster]

Not making fun but it looks like a petrified sweet potato. I swear it does. Close your eyes and look at it.

 

[Bbmbr]

It does lol!