Pickaxe/Armour Variants

I believe copper should be given a better use in Minecraft. Perhaps it can be used for tools slightly better than stone and armour in the middle of leather and iron. Copper tools should not be as good as iron. This is only because of how common copper is. I also think you should be able to make a stone pickaxe out of stone and andesite. Diorite and sandstone should create different types of stone pickaxes, with the only difference being name and texture.