Tool or rock??

[tishylu]

I found these on the river in Missouri. I thought it was weird they are shaped the same but different sizes. Plus I have other similar things

 

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[ANTIQUARIAN]

They look to be natural to me?

You might want to consider re-posting your thread here... Rocks/Gems

Dave

 

[Treasure_Hunter]

Natural rock, not an artifact.

 

[unclemac]

rock, the angles are natural. some minerals will break (fracture) at very predictable angles just like your rock.