Awesome day! Help me out guys!

[esk8erguy]

This is my first post, so i'll try to keep everything short and sweet. I live in crawford co arkansas, and figured I'd go out on my grand parents land today and do a few sweeps as it's right off the Ozarks. Anyways while detecting a creek I came across this rock. Something I've never seen before. You can tell it's very ancient, as I don't even know if it's stone. It seems to have a weird feel to it. Any ideas?

 

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[Mud Hut]

I think that is a natural concretion nodule, and was probably once filled with silica sand.

 

[WheatWaffle]

Don't know what it is but welcome to tnet!

 

[baspinall]

Think its a plow tip

 

[stewielouie]

I was thinking plow tip myself

 

[Mud Hut]

... a stone plow tip .. now there's a novel idea.