Well gave that 1/8 stained glass a try the other night, I would get the flat surface from one side completely removed then flip it over and try the other side and snap it in half, ever time. Guess I wasn’t supporting it right. It is nice glass though and would make a good hunting point or knife if it was thicker. It seems to be tougher then all the other glass I have tried, if the flaker scraps the point when I take a flake off it is still sharp, all the other glass I have tried the edge crumples on it if that happens. Even if you little abrade it, its still sharp enough to cut skin.
Bushman