Travertine can be used both indoors and outdoors but is used extensively outdoors. Travertine is a type of limestone, it is typically formed in hot springs. It forms by the precipitation of calcium carbonate. It is a softer stone than regular limestone. Travertine is more porous.
Limestone is a hard sedimentary rock, composed mainly of calcium carbonate or dolomite. It’s used extensively for walls cladding or even flooring. It’s an elegant stone that brings in shades of beige.
Quartz is a decorative stone which is used for countertops, and in flooring, and for stair steps. Quartzite is extremely popular due to its marble-like appearance and granite-like properties.