Description (From Recipaedia )
Stone bricks can be made by binding together several stones of regular shape. They are a strong building material, very resilient to explosions and digging.
Crafting
Use 4 blocks of either granite or cobblestone to craft stone bricks. You get 4 stone bricks.

Use
Stone brick is highly decorative and can be made into slabs and stairs. They have a high explsion resilience so are suitable for building protective walls.
Notes
- Stone bricks can be made without a crafting table.
- You can use any combination of granite and cobblestone to craft them.