The difference between marble and granit
Marble and granite are same natural stone, how is the different between them.
First, according to the cause of stone: marble Marble belongs to metamorphic rock Metamorphic rock is another stone that is naturally metamorphosed by a stone under the influence of high temperature and high pressure and minerals. The qualitative change may be recrystallization, texture change or color change. Natural marble is a metamorphic rock formed by the original rock in the earth's crust through high temperature and high pressure in the earth's crust. It belongs to medium hard stone and is mainly composed of calcite, limestone, serpentine and dolomite. There are usually obvious patterns and many mineral particles granite Granite belongs to igneous rock Igneous rocks are mainly formed by volcanic materials such as magma. The liquid magma under the surface is cooled and solidified. Mineral gases and liquids penetrate into the rock to form new crystals and various colors. Generally dark colors. Natural granite is igneous rock, also called acid crystalline plutonic rock. It is the most widely distributed rock in igneous rock. It belongs to hard stone. The rock is hard and compact. According to its crystal grain size, it can be divided into "weijing" and "coarse crystal". And "fine crystal" three. Second, according to the hardness difference: The hardness of the stone is calculated according to the Mohs hardness. The Mohs hardness is 6-7, which is a hard stone, such as granite. The Mohs hardness is 3-5 in the medium hard stone, such as marble, and the Mohs hardness is 1-2 in soft stone. Such as limestone and dolomite. Marble: Because marble generally contains impurities, and calcium carbonate is affected by carbon dioxide, carbide and water in the atmosphere, it is also easy to weather and dissolve, and the surface quickly loses its luster. Therefore, a small number of relatively stable and durable varieties such as white marble can be used outdoors, and other varieties are not suitable for outdoor use, and are generally only used for interior decorative surfaces. Mohs hardness is 3-5. Granite: Granite is harder than marble and is difficult to process, but resistant to acid and weathering. It is not easy to weather and deteriorate, and its appearance and color can be kept for more than 100 years. Therefore, it is mostly used for wall foundation and exterior wall finish. Granite is also used in high-rise building renovation projects due to its high hardness and wear resistance, for example, the floor of the lobby. Mohs hardness is 6-7. Third, the chemical composition distinction: Marble: It belongs to carbonate stone. Its main component is calcium carbonate, accounting for more than 50%. Others include magnesium carbonate, calcium oxide, manganese oxide and silicon dioxide. There are usually obvious patterns and many mineral particles. Granite: It is mainly composed of quartz, feldspar, hornblende, pyroxene, olivine and biotite. It belongs to silicate stone, and its composition is mainly silica, accounting for 65%~75%. (Acidic) Fourth, the classification of lines: Marble (alkaline): The mineral composition of marble material is simple, easy to process, most of the texture is fine, the mirror effect is good, and the natural texture is very rich. The disadvantage is that the texture is softer than granite, and it is easily damaged when it is hit by hard and heavy objects, and the light-colored stone is easily contaminated. Floor marble is chosen as monochromatic as possible. Since marble generally contains impurities, and calcium carbonate is exposed to carbon dioxide, carbides, and moisture in the atmosphere, it is also easily weathered and eroded, and the surface quickly loses its luster. Therefore, most marble varieties are not suitable for outdoor use, and are generally only used for interior decorative surfaces. The color temperature of marble color makes people feel warmer, softer, and most of them have textures or patterns, but there are a few exceptions, with obvious crystal particles, such as crystal white or rosin yellow. granite stone: granite stone is no color stripes, only the color speckled pattern, the pattern is characterized by small, uniform grains, and distributed with star-like mica highlights and sparkling quartz crystal. The finer the mineral particles, the better, indicate that the structure is tight and strong. The color temperature of granite color makes people feel cold and hard, and it is more wear-resistant. Most of the surface patterns look like flowers, and the color is brighter. The polished finish is higher than marble and generally has no grain and has uniform crystal grains. The characteristics of distribution, but a small part has rhythm, such as magic red. The rock is hard and compact, with high hardness and wear resistance. It is not easy to weather and deteriorate. The appearance and color can be kept for more than 100 years. Therefore, it is often used in high-grade building decoration projects. It is more suitable for outdoor balcony, courtyard, and guest restaurant floor and window sill in home decoration. . Five: color: Marble: The main component of marble is calcium carbonate, but the color of marble is related to the minerals contained. The main component is calcium carbonate which is white, contains copper in green or blue, contains cobalt in light red, and contains manganese as rose. Red, containing iron is yellow, containing strontium is light blue, containing graphite in black, grayish black. granite: the color of the stone mainly depends on the mineral composition, generally quartz, feldspar content, the stone color is shallow. When other minerals are present, the gray series granite and the gray series granite are formed. Among various minerals, the variety of feldspar (divided into plagioclase and feldspar) has a great influence on the color of granite. Generally, plagioclase makes the stone white and grayish white, and the feldspar makes the stone red, red stone. The shade of the shade is also related to the potassium content of feldspar. When the main component is potassium, the granite is beautiful and bright red. Quartz is mostly white or milky white in granite. The greater the transparency of quartz, the stronger the absorbance, the less reflected light, the lower the gloss of stone, and sometimes the color of white, yellow and purple. Black granite, which is mainly composed of dark minerals, is another major category of granite. The quality of the products must be pure black or black with green color and high gloss, such as Fengzhen black. Black mica and muscovite are harmful minerals for stone. Increasing the content of mica will make it difficult to polish the stone. When grinding, it will form a matt pockmark due to mica cleavage, or it will form pits due to mica peeling. The aesthetic level of the stone surface. In general, granite has a deep color, a single mineral, a high degree of crystallization, a small particle size, and a high gloss.
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