Building stone is used to cover the inner wall of the building, facade, road infrastructure, wall and foundation, street floor and sidewalk and various decorations. The materials made from stones and their uses are different, each of them has its own characteristics according to the characteristics of the stone. The most common building stones are:

• Granite

• Marble

• Travertin

Granite

Granite is one of the most widely used types of stone in the building, which is used in floors, walls, and stairs. This type of stone has a texture with medium to coarse grains and the minerals in it are found in various colors from pink to deep gray and even black. Granite is one of the heaviest stones and has great strength and resistance and has been found in cities such as Hamedan, Mashhad, Natanz, Gilan, Nehbandan, Yazd, Zanjan, Khormadreh, Tus and others.

It is worth noting that this stone can not only play an important role in strengthening the building, but because of the variety of colors, it is also used as an element to decorate various buildings. In addition to being widely used in the country, granite is considered one of the most important export stones of Iran.

The advantages of granite stone are its strength and resistance, high resistance to water and chemicals, beauty and uniform surface: unlike travertine, these stones have a completely uniform surface. Colors of granite stones can be divided into the following four categories:

Chocolate granites (elephant color and beige chocolate color), Zanjan spring chocolate granite and Khormadreh chocolate granite stone, black granite, Alamut black granite, Toisarkan black granite, Yazd red granite, Tusi granite (light gray), Natanz granite, Nehbandan granite, and Mashhad pearl granite

The price of granite stone

The price of granite, like other building stones, depends on several factors. The most important pricing factors for stones are:

Stone quality and analysis: The most important parameter of stone quality is its physical and chemical analysis. The closer the analysis of the granite stone is to the desired level, the higher the quality and the higher the price. Stone diameter and dimensions: Sometimes granite stones are cut with different thicknesses depending on the type of application. For example, the thickness of the face stone for scoping is different from the thickness of the floor stone. Also, the size of the stone plays a decisive role in determining the price of the stone. Slab stone is always more expensive than tile stone. Accurate stone sorting: Granite stones are sorted after the sub and stone cutting stage. Unblemished and uniform granite stones have a higher price. Type of stone processing: The type of stone processing plays a decisive role in the price of granite stone. The precision in cutting and smoothness of the stone, the amount of sub and polishing of the stone will affect its price. Disadvantages of granite stones are relatively high price, harmful radiation for the human body, high weight and low adhesion, lack of insulation for sound and heat.

Marble

This stone has been transformed from the category of limestones, and because of the less porosity they have compared to travertine stones, they have more relative resistance and weight, and they have less resistance and weight than granite stones.

The characteristics of marble stone due to the many mines inside Iran, marble stone can be found with a reasonable price and a lot of variety. In most marbles, you will see the design of many lines, which cannot be touched and felt in any way, and this has made it more beautiful.

Marble is one of the most similar stones to travertine, and the way to distinguish them for non-specialists is from the back of the stone (behind the eroded part).

The total number of marble mines in the country is about 652 mines, of which the largest share with 163 mines belongs to Isfahan province. Fars province with 76, Razavi Khorasan with 67 and Kurdistan with 51 mines are in the next ranks.

According to the distribution map of the mines, the marble poles can be considered as the center, south, northeast and west of Iran. Also, Fars province has the highest rank in the country in terms of the quality of marble stone, and most of the marble stones of this province are directly purchased by foreign merchants and transferred abroad for processing.

The advantages of marble, the beauty and variety of colors and surface design are almost uniform and more uniform than travertine, reasonable price, resistant to alkaline conditions.

Marble is a metamorphic rock formed by the metamorphosis of limestone. This mineral has large and specific crystals or in the form of granular masses, the most obvious characteristic of which is high purity and transparency (unlike marble). For this reason, the price of this stone is higher than other stones and they also have very high beauty, polish and transparency.

Marble is the best and most expensive construction and decorative stone in the world, which is available in various natural colors and designs in Iranian mines. Because of its unique beauty and high quality, marble is generally cut into large slabs and most of it is exported to other countries.

The salient features of marble are solubility, resistance, hardness, strength, color, texture, and porosity

The hardness of marble stones is 3 to 4. Needless to say, quartz marbles are harder than calcite marbles.

The quality of marble stones

Marble can be considered one of the best-selling stones. Most limestones have a low resistance to weather conditions, and marble stones are no exception to this in most types. If marble has the most resistance, it will have less veins, and that's why it should be bought. Stones with less veins can be the most suitable choice.

The price of marble stones

The price of marble stone depends on many factors and it is not possible to consider an exact price for it. The price of marble stones with less streaks will be higher than other types (such as Dehbid stone) and when buying, it is better to choose samples that have less streaks. Because in this case, the resistance of the stone will also increase.