For the exterior of the building, calcareous sedimentary stones are a better option, which are known in the market as travertine
Travertine stones are superior to other stones such as granite, etc. for the following reasons:
1. Porosity: causes the density of the rock to be reduced and there are no noticeable changes in the face of expansion and contraction.
Also, with the penetration of cement slurry in them, the stone is firmly in place.
2. Hardness less than 3: makes it easy to shape the stone
3. High color variety: leaves the hands of design engineers and architects in design open and attracts a wide range of tastes.
And other reasons that can be mentioned