Marble
1. Formation: Marble is formed from sedimentary rocks and metamorphic rocks of sedimentary rocks, usually accompanied by the texture of biological remains.
2. Ingredients: The main ingredient is calcium carbonate, and its content is about 50%-75%. Some marbles contain a certain amount of silica, and some do not.
3. Properties: weakly alkaline.
4. Structure: fine particles (referring to calcium carbonate), the surface stripe distribution is generally irregular, and the hardness is low.
5. The composition and structural characteristics of marble make it have the following properties:
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(1) Excellent decorative performance. Marble does not contain radiation and has bright and rich colors. It is widely used in the decoration of interior walls and floors.
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(2) Excellent processing performance: sawing, cutting, polishing, drilling, engraving, etc.
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(3) Marble has good wear resistance and is not easy to age, and its service life is generally about 50-80 years.
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(4) In industry, marble is widely used. Such as: used for raw materials, purifying agents, metallurgical solvents
Granite
1. Formation: Granite is formed by underground magma ejection and intrusion cooling crystallization, as well as granite metamorphic rocks.
2. Composition: The main component of granite is silica, and its content is about 65%-85%.
3. Chemical properties: The chemical properties of granite are weakly acidic.
4. Structure: The structure of granite is usually point-like structure, the particles are relatively coarse (referring to silica), the surface pattern distribution is relatively regular, and the hardness is high.
5. Due to the special conditions and firm structural characteristics of granite, it has the following unique properties:
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(1) It has good decorative performance and can be used for public places and outdoor decoration.
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(2) Excellent processing performance: sawing, cutting, polishing, drilling, engraving, etc. Its processing accuracy can reach below 0.5μm, and the luminosity can reach above 1600.
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(3) Good wear resistance, 5-10 times higher than cast iron.
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(4) The thermal expansion coefficient is small, and it is not easy to deform. It is similar to indium steel and is very slightly affected by temperature.
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(5) The elastic modulus is large, higher than that of cast iron.
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(6) Good rigidity, large internal damping coefficient, 15 times larger than steel. Can shock, shock absorption.
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(7) Granite is brittle, and only partially falls off after being damaged, which does not affect the overall straightness.
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(8) The chemical properties of granite are stable, it is not easy to be weathered, and it can resist the erosion of acid, alkali and corrosive gas. Its chemical property is proportional to the content of silica, and its service life can reach about 200 years.
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(9) Granite is non-conductive, non-magnetic, and has stable field potential.
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And so on, a lot of excellent performance.
