Ebonstone Brick

Ebonstone Brick is a building block. Unlike their raw block counterpart, they do not spread Corruption, nor do they spawn Eaters of Souls when present in high amounts, thus making them a safe construction material.

They can be used to make NPC houses and prevent enemies from spawning.

It's Crimson counterpart is. On non-1.4 platforms, Flesh Blocks, which can be used to make furniture, can be seen as the Crimson counterpart, but Ebonstone Brick cannot be used to make furniture. The can be used to make furniture, and were added in 1.4.

History
Brique de pierre d'ébène 黑檀石砖