Please help identify this rock

[AlabamaRockhound]

It was found digging out crawl space under a house built in 1956 about 2 foot deep.shiny kinda heavy but light for its size.strange...thanks

 

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[Vladimir bvm]

coal

 

[galenrog]

Vladimir is likely correct.

Time for more coffee.

 

[Rocks A Lot]

You must of been naughty if that's all you got for Christmas! Aaaand here's your coal!