Block of Copper is a solid metal block crafted from nine copper ingots. It gradually oxidizes through four stages, changing color from orange to green unless waxed with honeycomb to preserve its original state.

It can be obtained through crafting, stonecutting, or natural generation in trial chambers. Blocks of copper are commonly used for storage, construction, and crafting various copper-based blocks, including cut copper and chiseled copper. They can also be affected by lightning or an axe, which removes oxidation and restores their earlier state.