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, at a high temperature, about 2,000 °F (1,000 °C). and fired at a high temperature, about 2,000 °F (1,000 °C). Quarry tile is manufactured from clay in a manner similar to bricks.