Volcanic Glass/Impact glass ID help?

[Barobi2]

Found this out fishing the other day in North GA. My friend who is a geology major thought it was volcanic glass and pumice, but I've read that volcanic glass isn't found in GA. Any help with the ID is greatly appreciated!

 

[Indian Steve]

Possibly slag from an old iron furnace.

 

[Red-Coat]

Danged difficut keeping track when you post the same thing in multiple places. Replied on your other thread here:

http://www.treasurenet.com/forums/meteorites/630252-meteorite-impact-glass.html#post6465515

 

[Moesia]

Slag