A few Problems I have with this.
You're allowed creation from....nothing, from what I can tell. You cannot create something from nothing, even in the naruverse, except for a few exceptions. and those exceptions are at tremendous cost. To create glass you would need sand.
You're not very descriptive. You're kkg should be at least 1 or 2 paragraphs, and the history should be 2 paragraphs long. Jutsu need to be described better.
hmm.. glass thats hard as iron, steel, even harder than steel? Seems unnecesarily OP, you could've just gone with a metal creation clan