News - On the difference between marble and granite

On the difference between marble and granite

The way to distinguish marble from granite is to see their pattern. The pattern of marble is rich, the line pattern is smooth, and the color change is rich. The granite patterns are speckled, with no obvious patterns, and the colors are generally white and gray, and are relatively unitary.

The Granite
The granite belongs to igneous rock, which is formed by the eruption of underground magma and the invasion of cooling crystallization and metamorphic rocks of granite. With visible crystal structure and texture. It is composed of feldspar (usually potassium feldspar and oligoclase) and quartz, mingled with a small amount of mica (black mica or white mica) and trace minerals, such as: zircon, apatite, magnetite, ilmenite, sphene and so on. The main component of granite is silica, whose content is about 65% – 85%. The chemical properties of granite are weak and acidic. Usually, the granite is a little white or gray, and because of the dark crystals, the appearance is speckled, and the addition of potassium feldspar makes it red or fleshy. Granite formed by magmatic slowly cooling crystallization, buried deep under the surface of the earth, when unusually slow cooling rate, it will form a very rough texture of granite, known as a crystalline granite. Granite and other crystalline rocks form the basis of the continental plate, which is also the most common intrusive rock exposed to the earth’s surface.

Although granite is considered by the melt material or igneous rock magma, but there is plenty of evidence suggests that the formation of some granite is the product of local deformation or previous rock, they not through liquid or melt process and rearrange and recrystallization. The weight of granite is between 2.63 and 2.75, and its compressive strength is 1,050 ~ 14,000 kg/sq cm (15,000 ~ 20, 000 pounds per square inch). Because granite is stronger than sandstone, limestone and marble, it is harder to extract. Because of the special conditions and the firm structure characteristics of granite, it has the following unique properties:
(1) it has good adornment performance, can apply to public place and outdoor adornment.
(2) excellent processing performance: sawing, cutting, polishing, drilling, engraving, etc. Its machining accuracy can be below 0.5 mu m, and the luminosity is over 1600.
(3) good wear resistance, 5-10 times higher than cast iron.
(4) the thermal expansion coefficient is small and not easy to deform. It is similar to indium steel, which is very small in temperature.
(5) large elastic modulus, higher than cast iron.
(6) rigid, the inner damping coefficient is large, 15 times larger than steel. Shockproof, shock absorber.
(7) the granite is brittle and is only partially lost after the damage, which does not affect the overall flatness.
(8) the chemical properties of granite are stable and not easy to be weathered, which can resist acid, alkali and corrosion of the gas. Its chemical properties are in direct proportion to the content of silicon dioxide, and its service life can be about 200 years.
(9) granite has non-conductive, non-conductive magnetic field and stable field.

Usually, granite is divided into three distinct categories:
Fine granites: the average diameter of a feldspar crystal is 1/16 to 1/8 of an inch.
Medium grained granite: the average diameter of a feldspar crystal is approximately 1/4 of an inch.
Coarse granites: the average diameter of a feldspar crystal is about 1/2 inch and a larger diameter, some even to a few centimeters. The density of coarse granites is relatively low.
In recent years, granite accounts for 83 percent of the stone materials used in monument building and 17 percent of marble.

The marble
Marble is formed from metamorphic rocks of sedimentary rocks and sedimentary rocks, and is a metamorphic rock formed after the recrystallization of limestone, usually with the texture of biological remains. The main component is calcium carbonate, the content of which is about 50-75 %, which is weakly alkaline. Some marble contains a certain amount of silicon dioxide, some do not contain silica. The surface streaks are generally more irregular and have lower hardness. The composition of marble has the following properties:
(1) good decorative property, marble does not contain radiation and is bright and colorful, and is widely used in interior wall and floor decoration. Excellent machining performance: sawing, cutting, polishing, drilling, engraving, etc.
(2) marble has good wear-resisting property and is not easy to age, and its service life is generally about 50-80 years.
(3) in industry, marble is widely used. For example: used for raw materials, cleaning agent, metallurgical solvent, etc.
(4) marble has characteristics such as non-conductive, non-conductive and stable field.

From a business perspective, all natural and polished limestone rocks are called marble, as are some dolomites and serpentine rocks. Since not all marble is suitable for all construction occasions, marble should be divided into four categories: A, B, C and D. This classification method is especially applicable to relatively crispy C and D marble, which require special treatment prior to installation or installation.

Marble slab backing adhesive to strengthening and protecting

Specific classification is as follows:
Class A: high quality marble with the same, excellent processing quality, free of impurities and stomata.
Class B: the feature is close to the former type of marble, but the processing quality is slightly worse than the former; Have natural defects; Small amounts of separation, gluing and filling are required.
C: there are some differences in processing quality; Defects, stomata and texture fractures are more common. The difficulty of mending these differences can be achieved by isolating, gluing, filling, or reinforcing one or more of these methods.
Class D: the characteristics are similar to the type C marble, but it contains more natural defects, and the difference in processing quality is the biggest, and the same method is required to be processed multiple times. This kind of marble is a lot of color rich stone material, they have very good adornment value.

Marble granite use range of difference
The most obvious difference between granite and marble is that one is more outdoors and one is more indoor. Most of the natural stone materials that are seen in the interior are marble, while the speckled natural stone of outdoor pavement is granite.

Why is there such an obvious place to distinguish?
The reason is granite wear-resistant and resistant to corrosion, wind and sun can also use long. In addition, according to the radioactive level granite, there are three types of ABC: class A products can be used in any situation, including office buildings and family rooms. Class B products are more radioactive than class A, not used in the interior of the bedroom, but can be used in the interior and exterior surfaces of all other buildings. C products are more radioactive than A and B, which can only be used for exterior finishes of buildings; More than C standard control value of natural stone, can only be used for seawalls, piers and stele.

Black granite tiles for police officers club floor

Granite tiles for outdoor floor
The marble is beautiful and suitable for interior decoration. Marble land is exquisite, bright and clean as the mirror, has a strong ornamental, so is widely used in the art field, in the great hall of the people has a huge and exquisite marble screen. Marble radiation is faintly negligible, and the spread of marble on the Internet is a rumor.
Marble granite price difference

Arabescato marble for bathroom

Although granite and marble are high-grade stone products, the price difference is very large.
The granite pattern is single, the color change is little, the adornment sex is not strong. The advantage is strong and durable, not easy to be damaged, not to be dyed, mostly used outside. Granites range from tens to hundreds of dollars, while the wool is cheaper and the light is more expensive.

Marble texture is smooth and delicate, texture change is rich, the fine quality has landscape painting general charming pattern, marble is artistic stone material. The price of marble varies from hundreds to thousands of yuan, depending on the origin, the price of different quality is very big.

Palissandro white marble for wall decoration

From the characteristics, the role and the price difference, we can see that the difference between the two is very obvious. I hope that the above content will help you to distinguish between marble and granite.