Lime in limestone comes from seawater. Calcium carbonate, silica, clay, silt and sand are the components of limestone. Just like travertine, limestone is calcium rich sedimentary rock. Continued deposits of layered minerals, organic compounds and marine organisms been compacted by immense pressure and high temperatures to form the stones. This lithification process is what gives limestone its smooth, granular, and occasionally porous surface.
Trace evidence of fossils, shells, bones and specks of calcium deposits give limestone an enriched, earthy texture. Unlike travertine, its crystalline structure is not as evident and their surface holes and fissures do not have to be filled.
Limestone’s rugged durability made it a construction material of cathedrals, fortresses and castles during the medieval times.
Limestone colors are brown, black, gray, white and yellow. Limestone tiles are hard and can exposure to the elements, but are susceptible to acids.