Any ideas on this one

[Kaleb71386]

I totally forgot about this rock. I found it two months ago when me and my buddy was digging into a old farmers dump for bottles. I seen the rock and it looked like Flint so grabbed it then seen the hole totally full of dirt and was just going to throw it but my buddy talked me into keeping it.. oh well gives all you experts something to do 😀

 

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[Kaleb71386]

I'm just going to say it's a sinker does anyone else agree? I'll mark it as solved if so.