Stone bricks, also known as stone masonry units or stone blocks, are individual units of stone that are used in the construction of walls, buildings, and various architectural structures. These bricks are made from natural stones such as granite, limestone, sandstone, or slate.tone bricks, also known as stone masonry units or stone blocks, are individual units of stone that are used in the construction of walls, buildings, and various architectural structures. These bricks are typically made from natural stones such as granite, limestone, sandstone, or slate.