According to Sangestan Mahallat, marble is a combination of metamorphosed and limestone rocks. The weight of this type of stone is heavier than ordinary limestone and it is composed of calcite crystals.

This stone is formed by the deposition of limestone and heat and pressure. The gradual and long-term heat and pressure changes the texture and structure of limestone and gradually turns these stones into marble.

Metamorphosed limestones, such as marble, weigh more than limestone, however, marble is classified as a soft stone.

Marble is the result of changes in limestone. The amount of this transformation and the growth of crystals causes the creation of different "marble" stones; Marble stone with large crystal and in white or gray colors is called "crystal" and white crystal marble is called "chini". In "abri" marble, there are non-parallel bands, which are caused by the accumulation of dark and light minerals.

The main mineral and mother stone of marble is calcite, which is often combined with aragonite and in some cases with dolomite. Calcites are actually the result of crystallization of calcium carbonate.

Pure marble is white, but its different colors are created due to the presence of various impurities such as hematite, limonite, quartz and carbon compounds, and colors such as cream, red, brown, pink, black, mustard, green, etc. create

Intense sunlight over a long period of time damages marble. It is better to avoid this stone in places that are in constant proximity to heavy weather conditions. The most important application of marble stone is in the interior of the building.

We can use marble stones in outdoor spaces under two conditions: first, the stone is very thick, and second, the surface of the stone is rough and non-glossy. A famous example is the Freedom Tower, where "shahyadi" marble is used, with a non-glossy surface and uneven and thick.