Quarry tile

Quarry tile is a building material, usually 1⁄2 to 3⁄4 inch (13 to 19 mm) thick, made by either the extrusion process or more commonly by press forming and firing natural clay or shales. Quarry tile is manufactured from clay in a manner similar to bricks. It is shaped from clay, and fired at a high temperature, about 2,000 °F (1,000 °C).