Good. Glad that's settled. I agree. Slag glass.
Pic 6 and all the pieces in your second group could be Wake County or NC or VA.
Looks like a mica schist with something, maybe kyanite in it.
Not sure about the white layered rock. What's the hardness/
Second group, first 2 pics, look like a mica schist with garnet, That can be found in a lot of places in NC.
Not sure about Pic 3 but we sometimes call that stuff Squirrely.
Pic 4 looks like a mica schist with crystals of Actinolite, Horneblend, or maybe Epidote.
Last piece has an interesting shape and looks like it may have some talc or soapstone in the schist mix.
I guess you could slab some of the glass.