Copper Ore (block)

Copper ore is a mineral block found underground. It's one of the most common, and weakest mineral that can be used to craft tools and armor. Copper ore requires a stone pickaxe or better to mine, and it will drop between one and three copper ore items, which are smelted three at a time to get a  copper ingot. Copper ingots can be used to craft weak tools and armor, as well as accessories.

Natural Occurrence
Copper occurs above layer 16, up to layer 112. It's the most common ore found in the overworld, as well as tin.