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The difference between marble and granite
Construction [url = http://jiaju.sina.com.cn/] decoration [/ url], decorative decorative stone mainly marble and granite. Marble is mainly used indoors, and granite is mainly used outdoors, both of which are high-grade decorative materials. The use of marble and granite for interior and exterior finishes are effective and durable, but they are expensive, and are therefore used in projects that require high levels of public architecture and decoration. However, in recent years, with the improvement of living standards, the aesthetic concept of people's own living environment is constantly being updated, and marble and granite are also increasingly appearing in home decoration. Stones are mainly divided into two major categories: man-made and natural. Here we mainly introduce natural marble and natural granite. Natural marble is a type of metamorphic rock formed by high temperature and high pressure in the earth's crust. It belongs to medium hard stone and mainly consists of calcite, limestone, serpentine and dolomite. Its main component is calcium carbonate, accounting for more than 50%. Others include magnesium carbonate, calcium oxide, manganese oxide, and silicon dioxide. Because marble generally contains impurities, and calcium carbonate in the atmosphere by the role of carbon dioxide, carbides, water, but also easy to weathering and erosion, and make the surface lose luster quickly. Therefore, a few, such as white marble, AI Yeqing, etc., which are relatively stable and durable and have less impurities, can be used outdoors, and other varieties are not suitable for outdoor use. They are generally used only for interior decorative surfaces. Natural marble can be used to make decorative panels for high-grade decorative works. It can be used in interior walls, facades, railings, floors, windowsills, and services in public buildings such as hotels, exhibition halls, theaters, shopping malls, libraries, airports, and stations. The finishes on the door and the door of the elevator are ideal interior high-grade decorative materials. In addition, it can also be used to make marble murals, handicrafts, daily necessities, etc. Natural granite is igneous rock, also called acid crystal deep diagenetic rock. It is the most widely distributed type of rock in igneous rock and belongs to hard stone. It consists of feldspar, quartz and mica. Its composition is mainly silica, accounting for about 65%. ~75%. The rock is hard and dense, and can be divided into three kinds of "Pie-crystal", "Crystalline" and "Fine-grained" according to the size of the crystal grains. The quality of granite depends on the composition and structure of the mineral. The fine granite has fine and uniform crystalline particles, less mica content and more quartz, and does not contain pyrite. Granite is not easy weathering and deterioration, the appearance of color can be maintained for more than a century, it is mostly used for wall base and exterior wall finishes. Due to its high hardness and wear resistance, granite is also commonly used in high-rise construction works such as the ground floor of a lobby. Because granite is harder and more acid-resistant than marble, it is more suitable for outdoor terraces, patios, dining rooms and windowsills in home furnishings. Marble can be used for the counters of counters, cooking stations, and dining tables. 1. Granite Stone: Granite stone is not colored stripes, most of them are only colored spots, and others are solid colors. The finer the mineral particles, the better the structure is. 2. Marble plate: Marble material has simple mineral composition, easy processing, and most of the texture is fine, mirror effect is better. The disadvantage is that the texture is softer than granite, and it is easily damaged when hit by hard and heavy objects. Light-colored stones are easily contaminated. Paving the marble as much as possible to choose a single color, select the table when the striped fabric effect is better. Other methods of selection can refer to the method of selection of granite. Types of stone The types of stone commonly used today fall into four major categories: sedimentary rocks, metamorphic rocks, igneous rocks, and artificial stones. 1. Sedimentary rocks Sedimentary rocks are detached from the debris in organisms such as glaciers, rivers, winds, oceans, and plants, depositing and forming rock deposits, which are consolidated through high temperature and high pressure for millions of years. 1. Limestone: The main mineral composition is calcite. Mineral particles and crystal structure are rare, the surface is smooth, small particles. Hardness varies, some dense limestone can be polished. The colors are black, gray, white, yellow and brown. Limestone contains lime formed from seawater, hence its name. 2. Sandstone: Formed from quartz particles (sand), structurally stable, usually light brown or red, mainly containing silicon, calcium, clay and iron oxides. 3. Soapstone: It is formed from various kinds of talc and is very soft. It is a wear-resistant dense mineral that is not susceptible to smudging. 4. Fossils: Contains marine shellfish, natural fossils of plants, considered to be limestone. 5. Travertine (hole stone): generally creamy or light red, deposited from the calcite of hot springs. Many holes are formed due to the flow of water through the stones. These holes are filled with synthetic resin or cement, otherwise a lot of maintenance work is required. Limestone and marble. Second, Metamorphic Rock Metamorphic rock is another type of stone that is naturally degenerated by a stone under the mixture of high temperature and high pressure and minerals. The qualitative change may be recrystallization, texture change, or color change. 1. Marble is a recrystallized limestone that softens at high temperatures and pressures and recrystallizes to form marble when the contained minerals change. The main components are calcium and dolomite, with many colors, usually with obvious patterns and many mineral particles. Mohs hardness between 2.5 and 5. Marble is divided into three categories: Dolomite: Magnesite (calcium carbonate) content more than 40% Forsterite: Magnesite (calcium carbonate) content of 5% to 40%. Calcite: The content of magnesite (calcium magnesium carbonate) is less than 5%. 2. Slate: A metamorphic rock formed of claystone, sedimentary shale (sometimes made of quartzite). Mineral particles are fine, thin and brittle, usually black. , gray or green. 3. Serpentine is named after its snakelike skin. The most common colors are green and brown. Mohs hardness between 2.5 and 4. Contains large amounts of magnesium, derived from igneous rocks. Recrystallization and diamond polishing are sometimes poor. Third, the igneous rock igneous rock is mainly formed by volcanic materials, such as magma. The liquid magma below the surface cools and solidifies. Mineral gases and liquids penetrate the rock to form new crystals and various colors. Granite: Mainly formed of quartz (35%), feldspar (45%) and potassium, generally dark coloured. Calcite is very small even if it is contained. The texture is very hard, easier to maintain than marble, but there are still holes and smudges. According to the mixing ratio of quartz, mica and feldspar, granite is divided into different types. Black granite is calcium feldspar, contains very little quartz, feldspar, and its composition is different from real granite. Artificial stone Artificial stone is made of non-natural mixture, such as resin, cement and gravel binder. Terrazzo: Marble and granite fragments are embedded in the cement mixture. Agglomerated or aggregated stone: The marble chips are embedded in the colored resin mixture. Cultural stone or imitation stone resin mixture painted or mixed with paint, looks like marble.