Can anyone identify this stone?

[Reverend B*IKE*]

It was given to me from a friend years ago. He states it came from a dump area near a sort of mill/factory or foundry. I am not sure. Anyone who has any info or idea on this item It would be appreciated.
thanks

 

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[Felinepeachy]

I can't ID it but maybe you can follow this rock key and get an answer. It's pretty good. There is a series of questions that lead to other questions based on your answers until finally you find your rock

http://www.rockhounds.com/rockshop/rockkey/index.html

 

[DigginThePast]

Referred to as "slag", a byproduct produced from the foundry. Very common around sites such as those that you mention.

 

[Reverend B*IKE*]

Thanks Digging!

 

[DigginThePast]

 

[oldgoat]

good answer diggin, when I was a younger man I worked in steel mills and iron foundries in NY....each afternoon after the pour we would let the slag out of the furnace and do cleanup the next morning....I broke and shoveled a lot of that same material away