Green glass slag

[Squirrel322]

Found these chunks of what looks like green glass. What is it? What produces it? I can post better photos tomorrow in the daylight.

 

[ToddsPoint]

There's probably an old iron furnace like in the pic below, near you. They dumped the slag nearby, usually pretty close. In TN I found glass slag from a furnace that covered a whole hillside where they dumped. I was able to chip a few arrowheads from the glass for the archaeologist I was with. Here is a pic of some slag like yours. Gary

 

[Squirrel322]

Very interesting. I actually saw something there that I thought might have been a lead ingot, now i wonder if it was actually an “iron pig” produced by an iron furnace.

Thanks for the information.

 

[Tpmetal]

Todd is right on the money, Looks like iron slag to me.

 

[GoldieLocks]

There are green minerals that can occur within. Other organic materials too.

Or is it Michigan Star Stone?
See
https://www.mlive.com/entertainment/erry-2018/04/64a09f0d318324/isle_royale_greenstone.html

 

[NOLA_Ken]

It's smelting furnace slag, that stuff is everywhere out here from the old steel mills. Some of it is pretty nice looking and can be cut and polished for jewelry.