The ice brick is an arctic block that looks like a square brick made out of ice. It is found in the Architecture section of inventory. An ice brick takes up one square block of space and has full collision.
How to Obtain
You can craft ice bricks from ice or mine them in arctic worlds from generated structures, especially those on the surface. You can also trade for ice bricks in a market world.
How to Use
Like all arctic-based blocks and items, ice bricks can only be placed in arctic worlds, where they give a nice cool look to your builds. Hahaha, get it? Cool?
Ice bricks were added as part of the arctic biome update.