Dark Green Obsidian?

[romeo-1]

Found this rock today on a beach in Nova Scotia, Canada...Fundy Shore. Not sure if the photos show but it is very glassy...if that makes sense. Could this be a chunk of obsidian? I do know that it's not a chunk of melted glass...I've found many of those and this is not that. Thanks for looking and your input!

 

[Kray Gelder]

Obsidian or chert. Really has taken a beating in the surf. Cool find.

 

[smokeythecat]

I'm leaning more toward slag from a furnace. That also, essentially is glass from freed burned quartz from the original ores.

 

[Indian Steve]

I find very similar stuff near an old iron furnace near here. I agree with smokey.

 

[stdenis_jd]

yeah that's slag evidenced by all the tiny air bubbles. I'll bet there is/was a blast furnace nearby where they used to manufacture metals