Which is more expensive, granite or marble? The difference between marble and granite.

With the improvement of living standards, people's aesthetic concept of their living environment is constantly updated, and marble and granite are increasingly appearing in family decoration. The decorative stones used in building decoration mainly include marble and granite. Marble is mainly used indoors and granite is mainly used outdoors, both of which are high-grade decorative materials. Marble and granite, as indoor and outdoor finishes, have good decorative effect and are durable, but the cost is high, so they are often used in public buildings and projects with high decorative grade requirements. Let's see which is more expensive, granite or marble, and the difference between marble and granite.

I. Marble and granite areas

1, according to the origin of the stone.

(1) granite

Granite belongs to igneous rock.

Igneous rocks are mainly formed by volcanic substances, such as magma. Liquid magma beneath the surface cools and solidifies. Mineral gases and liquids penetrate into rocks, forming new crystals and various colors.

Generally dark in color. Natural granite is igneous rock, also known as acid crystalline plutonic rock, which is the most widely distributed rock among igneous rocks. It belongs to hard rock, and the rock is hard and dense. According to the size of its crystal particles, it can be divided into three types: "giant crystal", "coarse crystal" and "fine crystal".

(2)2, marble

Marble belongs to metamorphic rocks.

Metamorphic rock is a kind of stone that naturally degenerates into another kind under the mixed action of high temperature, high pressure and minerals. Qualitative change may be recrystallization, texture change or color change.

Natural marble is metamorphic rock formed by high temperature and high pressure in the earth's crust. It belongs to medium hard rock and is mainly composed of calcite, limestone, serpentine and dolomite. Usually there are obvious patterns and many mineral particles.

2, according to the different hardness

The hardness of stone is calculated by Mohs hardness. Mohs hardness is 6-7, belonging to hard stone, such as granite; Mohs hardness is 3-5, which belongs to medium-hard stone, such as marble; Mohs hardness 1-2 belongs to soft rocks, such as limestone and dolomite.

(1) marble

Because marble generally contains impurities, calcium carbonate is easily weathered and dissolved by carbon dioxide, carbide and water vapor in the atmosphere, and the surface quickly loses its luster. Therefore, a few stable and durable varieties, such as white marble and Ai Yeqing, have pure quality and few impurities, and can be used outdoors, while other varieties are not suitable for outdoor use and are generally only used for indoor decorative surfaces. Mohs hardness is 3-5.

(2) Granite

Granite has higher hardness than marble and is difficult to process, but it is acid-resistant and weathering-resistant. It is not easy to be weathered and deteriorated, and the appearance color can be maintained for more than 100 years. It is mostly used for wall foundation and external wall decoration. Because of its high hardness and wear resistance, granite is often used in high-grade building decoration projects, for example, the floor of lobby. The Mohs hardness is 6-7.

3, chemical composition distinction

(1) marble

It belongs to carbonate rock, the main component is calcium carbonate, accounting for more than 50%, and others are magnesium carbonate, calcium oxide, manganese oxide and silicon dioxide. Usually there are obvious patterns and many mineral particles. (alkaline)

(2) Granite

It is mainly composed of syenite, feldspar, amphibole, pyroxene, olivine and biotite, belonging to silicate rocks, and its composition is mainly silica, accounting for about 65% ~ 75%. (acidity)

Second, the price of granite and marble.

Dali, Yunnan is rich in marble. High compressive strength, low water absorption, easy cleaning and delicate texture. It is an advanced indoor floor decoration material. General home decoration can choose marble per square meter 100-200 yuan. The disadvantage of marble is that it will quickly react with moisture and carbon dioxide in the air in the environment, making its surface lose luster and become rough.

Granite has the advantages of wear resistance, good frost resistance, weathering resistance, corrosion resistance and beautiful color. The floor of the home is decorated with granite, which can make the room look noble and elegant, showing luxurious style. However, it is more expensive, and the average family can choose a variety of about 200-300 yuan per square meter.