Found in creek...?

[dbag1969]

Obsidian or glass?

 

[rock]

Some do knap that type of slag for points if it is big enough.

 

[pippinwhitepaws]

slag - Bing Images

 

[ncnurseryman]

Wow. That stuff is gorgeous. So its just industrial waste product?? That blue is stunning.

 

[painterx7]

Yes just waste product from ore mining in the 1800's I know where there is fields of this stuff

 

[Jon Stewart]

That blue slag might make a nice looking arrowhead.

 

[painterx7]

I know a couple guys who knap flint I might bring them a piece and see what they can do . It would b pretty !!!