Grey Limestone is a sedimentary rock composed of Calcite and Aragonite. In sedimentary rock, limestone slabs and tiles are highly water soluble. Grey Limestone tiles have a soft touch aged appearance and are the most durable and hard wearing type of natural stone tiles. Grey Limestone is an excellent natural stone for modern interior and exterior design projects. It is both strong and durable, as well as stylish, and it can be used for almost any application in both residential and commercial settings.