Oxidized Cut Copper Slab is the final oxidized stage of a cut copper slab. It generates naturally in trial chambers. Oxidized cut copper slabs can be mined with a stone pickaxe or higher. If mined without a pickaxe, they drop nothing.

They can be crafted using oxidized cut copper or obtained through stonecutting. Unlike other cut copper slabs, oxidized cut copper slabs no longer undergo further oxidation. However, their oxidation can be removed by striking them with lightning or using an axe. Oxidized cut copper slabs function like other slabs in terms of placement and collision. They can also be placed under note blocks to produce a bass drum sound.