It is a porous lime stone with chemical origin. Its resources in the country comes to 450 million ton where some like Azarshahr red travertine is unique and beautiful due to its quality, color, and diverse patterns and there are many customers in Iran and America markets. It is known as a luxury and expensive stone among its supporters and Iran is the only exclusive producer. Mahallat white travertine which its resources are assessed at around 12/5 million ton is considered as the best export block stones. Small and big black travertine stones are discovered.