“Grey limestone” means gray colored limestone. Limestone is a depositional rock composed of calcium carbonate minerals. Gray limestone is often used in various fields such as construction, sculpture, decoration and landscaping. Its formation usually occurs through the fossilization of marine shells or calcium carbonate precipitation. The color tone and structure on its surface may vary depending on the geological characteristics of the environment and the limestone formation process. This type of limestone is preferred as a building material that has aesthetic value and is durable.