Green Obsidian? Calcite? Epidote? Slag?

[Beaglejuice13]

Found in Michigan's U.P. over 20 yrs ago. It's either a metamorphic rock or slag glass with sharp edges. A flat waxy gray colored layer is ribboned throughout along with some sediment but mostly dark green glassy material. Appears black when dry.

 

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[fuss]

That is most likely slag, and a cool looking slag

 

[Beaglejuice13]

Thanks for the response. That's what I was leaning towards was slag, but it was worth checking lol!! And thanks, I think its pretty cool too. Been in my landscaping border forever, people always think its obsidian.