【Material selection knowledge】 The difference between granite and marble

Granite and marble are common stones in our daily life. Both gloss and texture are rare good stones. However, these two kinds of stones have different characteristics and characteristics after all. In your mind, which kind of stone do you prefer, is marble with beautiful texture or granite with hard texture? Let the editor take you to understand these two kinds of rocks, understand the difference between granite and marble , so that you have a clear and clear answer in your heart.

1. Marble

Marble is formed by sedimentary rocks and metamorphic rocks of sedimentary rocks. It is a metamorphic rock formed after the recrystallization of limestone, usually accompanied by the texture of biological remains. The main component is calcium carbonate, its content is about 50% -75%, it is weakly alkaline. Some marbles contain a certain amount of silica, and some do not. The particles are fine (referred to as calcium carbonate), the surface streak distribution is generally more irregular, and the hardness is lower. The composition and structural characteristics of marble make it have the following properties:

(1) Good decorative performance, marble does not contain radiation and is beautiful in color and rich in color. It is widely used for decoration of indoor walls and floors. Has excellent processing performance: sawing, cutting, polishing, drilling, carving, etc.

(2) The abrasion resistance of marble is good, not easy to age, and its service life is generally about 50-80 years.

(3) In industry, marble is widely used. Such as: used for raw materials, purification agents, metallurgical solvents, etc.

(4) Marble has the characteristics of non-conductivity, non-magnetic conductivity and stable field position.

From a commercial perspective, all naturally occurring calcareous rocks that can be polished are called marble, as are certain dolomites and serpentines. Because not all marbles are suitable for all architectural occasions, marbles should be divided into four categories: A, B, C, and D. This classification method is particularly suitable for relatively brittle C and D marbles, which require special treatment before or during installation.

The specific classification is as follows:

Class A: high-quality marble, with the same and excellent processing quality, free of impurities and pores.

Type B: The characteristics are close to the former type of marble, but the processing quality is slightly worse than the former; there are natural defects; a small amount of separation, adhesion and filling are required.

Category C: There are some differences in processing quality; defects, pores, and texture fractures are more common. Repairing these differences is moderately difficult, and can be achieved by one or more of the following methods: separation, gluing, filling, or strengthening.

Type D: The characteristics are similar to those of type C marble, but it contains more natural flaws and the biggest difference in processing quality. It requires the same method for multiple surface treatments. This type of marble is affected by many colorful stones, and they have good decorative value.

2. Granite

Granite is an igneous rock, formed by underground magma ejection and intrusion cooling crystallization, and granitic metamorphic rock. With visible crystal structure and texture. It consists of feldspar (usually potassium feldspar and feldspar) and quartz, mixed with a small amount of mica (biotite or muscovite) and trace minerals, such as: zircon, apatite, magnetite, ilmenite And sashimi and so on. The main component of granite is silica, and its content is about 65% -85%. The chemical properties of granite are weakly acidic. Normally, granite is slightly white or gray. Due to the dark crystals, the appearance is speckled. The addition of potassium feldspar makes it red or flesh-colored. Granite is formed by the gradual cooling and crystallization of magma, and it is buried deep below the surface. When the cooling rate is extremely slow, it forms a kind of granite with very rough texture, which is called crystalline granite. Granite and other crystalline rocks form the basis of the continental plate, and it is also the most common intrusive rock exposed on the surface of the earth.

Although granite is considered to be igneous rock formed by melted material or magma, there is a lot of evidence that some granite formation is a local deformation or a product of previous rocks, and they are not rearranged and recrystallized without undergoing a liquid or melting process.

The specific gravity of granite is between 2.63 and 2.75, and its compressive strength is 1,050 ~ 14,000 kg / cm2 (15,000 ~ 20,000 psi). Because granite is stronger than sandstone, limestone, and marble, it is more difficult to mine. Due to the special conditions and firm structural characteristics of granite formation, it has the following unique properties:

(1) It has good decorative performance and can be applied to public places and outdoor decoration.

(2) Has excellent processing performance: sawing, cutting, polishing, drilling, carving, etc. Its processing precision can reach below 0.5μm, and its luminosity can reach above 1600.

(3) Good wear resistance, 5-10 times higher than cast iron.

(4) The coefficient of thermal expansion is small, and it is not easy to deform. It is similar to indium steel and is very little affected by temperature.

(5) The modulus of elasticity is large and higher than that of cast iron.

(6) Good rigidity, large internal damping coefficient, 15 times larger than steel. Can be shock-proof and shock-absorbing.

(7) The granite is brittle, and only partially falls off after damage, without affecting the overall straightness.

(8) Granite has stable chemical properties, is not easy to be weathered, and is resistant to acid, alkali and corrosive gases. Its chemical property is proportional to the content of silica, and its service life can reach about 200 years.

(9) Granite is non-conductive and non-magnetic, and the field position is stable.

Generally, granite is divided into three different categories:

Fine-grained granite: The average diameter of feldspar crystals is 1/16 ~ 1/8 inch.

Medium-grained granite: The average diameter of feldspar crystals is about 1/4 inch.

Coarse-grained granite: feldspar crystals have an average diameter of about 1/2 inch and larger crystals, and some even reach a few centimeters. The density of coarse-grained granite is relatively low.

In recent years, among the stone materials used in monument buildings, granite accounts for 83% and marble accounts for 17%.

Editor's summary: Relevant information about the difference between granite and marble is introduced here for everyone. I hope this article will be helpful to everyone. If you still do n’t understand something, you can leave a comment below, we will answer it as soon as possible.

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