Krazymans Tough Glass

v1.4  Adds Iron Glass Blocks, Panes and Slabs.             Cobblestone Strength, Mine with Iron Pick.

         Adds Obsidian Glass Blocks, Panes and Slabs.     Obsidian Strength Glass, Mine with Diamond Pick. 50% easier to mine than Obsidian, with same Blast Resistances of Obsidian.

Iron Glass, cheap, tough Ghast-Proof Glass for The Nether.

Obsidian Glass for The Nether, and Mob Farms.

Mobs don't spawn on the Iron and Obsidian Slabs.