Stone Selection: Limestones & Travertines
Both these stones are sedimentary stones. While limestone is composed primarily of calcium carbonate (>50%) it contains other minerals too. If the magnesium content is >50% then it is considered a dolomite rather than a limestone. Travertine is a crystalline form of calcium carbonate that develops in layers near cold and warm mineral springs. The holes in the travertine are formed from the percolating action of the mineral springs (as seen on the stone selection page). Limestones and travertines can both vary greatly in their hardness, density, and porosity.