What kind of rock is this?

[treasurea1]

I found this unusual rock at a park near my house and I pulled a tiny iron ball from inside the rock.

 

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[galenrog]

Another thread started? Same rock. Same question. Same answer. Black...ish. That is all I can derive from a poorly lit, poorly focused image.

 

[DDancer]

Without good pics cant tell what it is.

 

[Whiplash00]

Is it magnetic?