Limestone is the quintessential example of rugged sophistication. It’s a sedimentary rock which forms at the bottom of the ocean over millions of years. Limestone consists primarily of calcium carbonate making the stone porous. It can have a magnificent display of fossils visible within the stone however this is not very common. Limestone is not a hard stone and has a Mohs rating around 3 and 4 (out of 10) compared to granite which ranks around a 6. Limestone is great multi-functional stone that you can use around your fireplace or outside around your patio to host your guests.