Brick

Bricks are items that can be used to craft a few different brick-based blocks. Bricks can thrown to deal damage.

Smelting
A brick can be obtained by smelting clay.

Combat
Bricks can be thrown by right clicking.

They deal 4 damage (2 hearts) upon hitting a player or mob

Thrown bricks can also break glass, though its a little buggy, so you may need to try a few times