Need help with ID rock

[Rhj1991]

Got another one wasn't sure if it's flint or something else. Thank you all for your help

 

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[fuss]

will it fizz with muriatic acid or strong vinegar? it could be a quartz or calcite. Very hard to tell with just these images.

 

[Rhj1991]

I haven't had a chance to check yet but the rock was extremely hard to break as compared to flint which I usually find.