Discovered this today in a load of landscaping rocks. Can anyone help identify?

[nrsearcher]

I found this today and it has no magnetism and leaves a faint mark on bare porcelain and definitely scratches glass. It is 2.5” L x 1.5” W and approximately .75” thick, weighs 76 grams.



I tried google image search but nothing similar comes up. It is very shiny.



Any ideas? It has my curiosity going.

Thanks for any suggestions.

 

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[nrsearcher]

Was the small red rock lava rock cinders? If so, I’d have to agree with the slag theory. I think I’d still hang on to it though. Neat conversation piece.

Yep, makes sense. thanks!

 

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[nrsearcher]

Here's the piece I found many years ago. It was on an old property that dated back to the late 1700's. It later became a dairy farm.

Very cool. Thank you