Metallic Rock ID Help

[LogansRun]

Found this rock out in the yard this morning on top of the ground. Used the tip of a knife and dug into it and its a solid silver like material. Its very heavy for its size. Touched it with a paperclip magnet and it doesn't seem to be magnetic. One side is black and crusty almost like it was burnt. Any ideas on what it might be?

 

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[Goodyguy]

Looks like slag

 

[Tony in SC]

Burned/melted aluminum?

 

[ArfieBoy]

It looks like slag metal to me, too!

 

[LogansRun]

Thanks for the ideas. I thought maybe I had a celestial treasure of some sort. I manage to break it in half with a vice grip and took a few pics of the inside. I still can't figure out how a piece of slag ended up in a spot in my yard where I walk almost daily and was just laying on top of the grass. Oh well, thanks again for the replies.