Help identifying.

[timewasted]

Been lurking around the forums and decided to go ahead and ask a question myself. I found this rock several years ago and I couldn't identify it myself, but it does look neat. It's glossy dark green, porous rock. Perhaps someone on these boards might have an idea? Images attached below.

 

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[DDancer]

Do you recall where you found it?

 

[ScubaDetector]

It really looks like coal slag from an old furnace. Hope I am wrong though.

 

[timewasted]

Do you recall where you found it?

Yes, in the Bialowieza Forest, Poland.

It really looks like coal slag from an old furnace. Hope I am wrong though.

Maybe, but I have my doubts.

 

[DDancer]

Scubadetector is more likely correct in that being slag from a furnace. The other possibility to me was obsidian however the geology for where you found it does not support that material.