With the improvement of living standards, people's aesthetic concepts of their own living environment are constantly updated, and marble and granite are more and more appearing in home decoration. The decorative stones used in construction and decoration mainly include marble and granite. Marble is mainly used indoors, and granite is mainly used outdoors, all of which are high-grade decorative materials. The use of marble and granite for indoor and outdoor decoration is good and durable, but the cost is high, so it is often used in public buildings and projects with high decorative requirements. Let's take a look at the expensive granite and marble and the difference between marble and granite. 1. The area of ​​marble and granite 1. Divided by the cause of stone (1) 1. granite Granite belongs to igneous rock Igneous rocks are mainly formed from volcanic materials, such as magma. The liquid magma under the surface cools and solidifies. Mineral gases and liquids penetrate the rock to form new crystals and various colors. Generally dark colors. Natural granite is igneous rock, also known as acidic crystalline deep diagenetic rock. It is the most widely distributed rock in igneous rock. It is a hard stone and the rock is hard and dense. It can be divided into "weijing" and "coarse crystal" according to its crystal particle size And "fine crystal" three. (2) 2. Marble Marble belongs to metamorphic rock Metamorphic rock is another kind of stone that is naturally transformed from one kind of stone under the mixing action of high temperature and high pressure and minerals. The qualitative change may be recrystallization, texture change or color change. Natural marble is metamorphic rock formed by the original rock in the earth's crust through the action of high temperature and pressure in the earth's crust. It belongs to medium hard stone, mainly composed of calcite, limestone, serpentine and dolomite. There are usually obvious patterns and many mineral particles. 2. According to the hardness The hardness of stone is calculated by Mohs hardness. Mohs hardness is hard stone in 6-7, such as granite, Mohs hardness is 3-5, it is medium hard stone, such as marble, and Mohs hardness is 1-2. , Such as limestone and dolomite. (1) Marble Because marble generally contains impurities, and calcium carbonate is affected by carbon dioxide, carbides, and moisture in the atmosphere, it is also easily weathered and corroded, and the surface quickly loses its luster. Therefore, a few, such as Chinese white jade, Artemisia chinensis, etc., are relatively pure, stable and durable varieties with few impurities can be used outdoors, other varieties are not suitable for outdoor use, generally only used for indoor decorative surfaces. Mohs hardness is 3 to 5. (2) Granite Granite has a higher hardness than marble and is difficult to process, but it is resistant to acid and weathering. It is not easy to weather and deteriorate, and the appearance and color can be maintained for more than 100 years, so it is mostly used for wall foundation and exterior wall decoration. Because of its high hardness and wear resistance, granite is also commonly used in high-end building decoration projects, such as the lobby floor. Mohs hardness is 6-7. 3. Chemical composition distinction (1) Marble It belongs to carbonate stone, and its main component is calcium carbonate, which accounts for more than 50%. Others include magnesium carbonate, calcium oxide, manganese oxide, and silica. There are usually obvious patterns and many mineral particles. (Alkaline) (2) Granite It is mainly composed of quartz, feldspar, hornblende, pyroxene, olivine and biotite. It is a silicate stone. Its composition is mainly silica, accounting for about 65% to 75%. (Acidic) 2. Granite and marble prices Marble is abundant in Dali, Yunnan. It has high pressure resistance, low water absorption, easy to clean, and detailed texture. It is a high-grade interior decoration material. The general family can choose marble of about 100-200 yuan per square meter when decorating. The disadvantage of marble is that it will quickly react with moisture and carbon dioxide in the air in the environment, making its surface tarnish and rough. Granite has the advantages of wear resistance, good frost resistance, weathering resistance, corrosion resistance, beautiful color and so on. The home floor is decorated with granite, which can make the room noble and elegant and show luxurious style. But its price is more expensive, the general household can choose about 200-300 yuan per square meter. Editor's summary: The above is the relevant information about the difference between granite and marble, and the difference between marble and granite. It is for reference only, and I hope it will be helpful to everyone. 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