help me id this please

[treasureNoob]

So i have this rock, I was given many years ago by a man who was moving. It now sits in my yard. If you could help me, I am curious to know what it is. I have no idea where it came from or if it is unique or not.

 

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[rock]

Some use those big rocks for their yard. Nothing special about it that I can see. I have some more if you want them that I would like to get rid of.