What kind of rocks are these?

[WhiteRabbit1220]

I found them in Middle Tennessee. They were very concentrated in the area. They're black, with blue/purple or green tints, some more than others. Some are smooth and feel just like glass and some are rough/bumpy. Any input would be much appreciated. They look better in person.

 

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[Indian Steve]

I'm thinking that they are slag from an old iron furnace. I've found similar around and old iron furnace

 

[WhiteRabbit1220]

Okay, I was wondering that myself but thanks for confirming. I like them anyway.

 

[Indian Steve]

When I first found the ones that I found, I thought I was finding obsidian but there isn't any obsidian in Virginia. They are still cool!