Heavy, worked stone. Native American?

[Detector mom]

Found in stream in northern NJ town settled in 1600s, Native American presence long before. Wonder if it could be a mano or pestle, as in Herbert Kraft’s catalog.

 

[tamrock]

I'm thinking a good possibility, but the mechanics of geology can also produce many amazing things to behold. Let's see what the verdict of other might be.

 

[ToddsPoint]

I vote artifact. That even taper doesn't happen in nature, at least not very often. Gary

 

[jewelerguy]

I would lean towards artifact 'if' when it was found that it seemed out of place, such as not matching the color and general shapes of any of the surrounding rocks and gravel. If it just seemed like an odd shape of many other similar colored stones, then I'd lean more towards it being natural

 

[Tony in SC]

I think it's a nice ground piece.

 

[flinthunter]

From the pictures I just can't see any man made alterations on it. I feel that it is natural. JMHO

 

[CRUSADER]

Looks like a wet stone for sharping blades to me, but thats from a UK perspective.