Quarry tile
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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.[1][2] Quarry tile is manufactured from clay in a manner similar to bricks.[3] It is shaped from clay, and fired at a high temperature, about 2,000 °F (1,000 °C).[3]
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