Limestone is a sedimentary rock composed of ancient corals and marine organisms. Often times, you can see the actual shells and shapes of fossilized animals in the stone. In Texas, it’s frequently used in exterior construction and is also known as “Austin Stone.” The most common type of limestone that we use to make countertops come from Spain and other places around the world. Due to its porous nature, we don’t recommend using limestone in heavy use areas. Limestone is very susceptible to staining and etching.