Travertine is a sedimentary polycrystalline rock made of calcium carbonate sedimentation from mineral or thermal springs or running water rich in calcium. Most often, its structure has stripes running in the direction of the water, but there is also a variety with concentric circles. Depending on the place where it originated, travertine may be either coming from springs, from running waters, or from caves (stalagmites and stalactites).
Travertine is a natural stone with Mohs hardness of 2.8 – 3.0; it is also porous. Normally, it is beige, yellow, white, pink, brown, or ochre, depending on its impurities and minerals.
It has been used since ancient times in construction as a material for exterior and interior wall linings, flooring, façades, and decorative elements.