Ideas for Special Material Effects.

In my mod, Chaos & Calamity, I want to have tools and armor have special effects depending on the material they're made of. What I've decided do far: silver tools do extra damage to undead mobs, and the armor has a weak thorns effect against undead as well, diamond armor and tools have a chance to create a damaging shard when hitting or being hit, and sodium armor explodes if worn in water. If you have any ideas for the special effect of copper, tin, gold, iron, brass, and bronze, please share them.