Bone Blocks are a type of block that can be found on Desert planets, both on the surface and underground, they occur naturally in a unique Flesh mini-biome, and it is common to find them near flesh blocks deep in the underground. Small piles of the block may also be found within Underground Floran Prisons. It makes a unique sound when stepped upon, as one might expect.
The block can be crafted, but its recipe is hidden at first. It unlocks when players pick up their first Bone.