Characteristic differences between granite and gneiss

Granite: A plutonic acid igneous rock.

Commonly known as granite. Silicon dioxide.

The content is mostly above 70. The color is lighter, and grayish-white and flesh-red are more common. It is mainly composed of dark minerals such as quartz, feldspar, and a small amount of biotite.

Gneiss: a kind of metamorphic rock, slightly laminated but not cracked into thin sections, often forming discontinuous bands between light and dark colors, composed of quartz, feldspar, mica, hornblende, etc., hard texture, used as building materials.

When the pressure of the accumulated rock sinking into the ground is very high, and when the temperature is very high, it will recrystallize and become metamorphic rock. If the metamorphic rock continues to sink deeper, then higher temperatures will melt it and turn it into magma.

The molten magma is squeezed upwards and cooled to form igneous rocks.

Granite. Construction: Block-like construction.

Structure: Isogranular structure of particles (generally medium coarse grains).

Main mineral components: potassium feldspar, plagioclase, quartz, biotite.

Feldspar quartz sandstone.

It is divided into: siliceous feldspar quartz sandstone and calcareous feldspar quartz sandstone.

Siliceous feldspar quartz sandstone.

Construction: Block-like construction.

Structure: Medium sand structure.

Main components: quartz, feldspar sand; Siliconeous cement.

Identification basis: 50% of the rock; Quartz accounts for 75-95% of the sand grains, feldspar cuttings; Cemented siliceous.

Calcareous feldspar quartz sandstone.

Construction: Block-like construction.

Structure: Stucculous fine sand structure.

Main ingredients: quartz, feldspar sand, calcite clay crystal.

Identification basis: 50% of the rock; Quartz accounts for 75-95% of the sand grains, feldspar cuttings; The sand grains are filled with plaster.

Granitic gneiss.

Construction: Sheet hemp structure.

Structure: Particle structure (fine, medium, coarse).

Main components: Like granite, it contains feldspar, biotite, quartz, amphibole and other minerals.

a.The chemical composition is different.

b.The mineral composition is different.

c.The structure and construction of rocks are different.

d.The grinding rate of color acres is different.

Correct Answer: The structure and structure of the pleasure rocks are different.

Granite is a kind of granite, the surface is pockmarked spots, with black and white spots, red and black spots, etc., granite is a kind of granite with greater density and hard texture, which is often used as architectural decoration, carving sculpture, stone grinding, etc.

Because of its acid and alkali resistance, granite is often used in the field of industrial anti-corrosion, such as anti-corrosion flooring, acid tank, sulfuric acid pool, equipment anti-corrosion lining, etc., and is also widely used in the construction of desulfurization and dust removal equipment.

Gneiss, also known as biotite, feldspar, is an acidic rock formed by the rise of magma deep in the strata. Its English name comes from the Latin word meaning "grainy". The granite of T-shaped bay is a medium-grained light white structure, temperature-resistant, wear-resistant, corrosion-resistant, and has a compression resistance of 2040 kilograms per square centimeter, which is a high-grade building material.

1. The degree of deterioration is different.

Both gneiss and schist are metamorphosed from shale, and the degree of metamorphism of gneiss is deeper than that of schist. The deeper the degree of denaturation, the larger the crystallization, and the more serious the leaf management phenomenon.

2. The structure is different.

The gneiss has an obvious gneiss-like structure with a medium-coarse-grained scale (fiber) granular metacrystalline structure.

The schist has a lamellar vertical section structure, which is mostly a scaly metamorphic structure or a scaly granular metamorphic structure, and the grain size is fine.

3. The composition is arranged in different ways.

Gneiss: mainly composed of granular minerals and a small number of flake or columnar minerals in an intermittent parallel arrangement; Among them, the granular minerals are mainly feldspar and quartz, with a content of more than 50 or more, and feldspar is more than quartz, and the feldspar content is more than 25%.

Schist: mainly composed of sheet, columnar, granular minerals are arranged in a continuous direction, of which flake or columnar minerals are at least 30, granular minerals are often dominated by quartz, feldspar content 25.

It belongs to the three major types of fire sedimentation rocks, so let's briefly distinguish them from the outside.

Granite: the main mineral components are feldspar, quartz and mica, feldspar mica semi-automorphic, quartz other shape, mineral distribution is relatively uniform, mineral height orientation is not strong, sometimes you can see coarse feldspar grouper.

Crystal. The particle size of granite minerals can vary greatly depending on the origin or period. Formed by the cooling of acidic magma.

Gneiss. The composition is similar to that of granite, mica or other dark minerals are often distributed in uneven bands (or layers), while feldspar forms eyeballs and is produced between belts, and the mineral orientation is relatively strong, which is a typical "gneiss" structure. It is a deep metamorphic rock.

Sandstone. It is a kind of sunken rock with bedding. The mineral composition is mainly branch-absorbing quartz, which can be seen to be granular with grinding phenomenon, cemented by clay, iron and clay, siliceous and so on, and mica is mostly light-colored fragments, with little content and a tendency to concentrate on the layer.

Sometimes there are also gravels with different rock Qiqiao stove stone compositions and better grinding gardens in the sandstone.

If the gravel content is high, it will transition to conglomerate.

Summary. Hello, glad to answer for you. What are the characteristics of granite?

1. Granite has a dense structure, high compressive strength, low water absorption, high surface hardness, good chemical stability, strong durability, but poor fire resistance.

2. Granite is a fine-grained, medium-grained, coarse-grained granular structure, or a patchy structure, with uniform and fine particles and small gaps (porosity is generally, and the water absorption rate is not high (the water absorption rate is generally, and it has good frost resistance.

3. The hardness of granite is high, its Mohs hardness is about 6, its density is between g cm3, its compressive strength is 100-300MPa, of which fine-grained granite can be as high as 300MPa or more, and the flexural strength is generally 10 30MPa.

Fourth, granite has a high rate of abandonment, can be processed in various ways, and the plate can be spelled well. There is also granite that is not easy to weather, and can be used as outdoor decorative stone.

What are the characteristics of granite?

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Hello, glad to answer for you. What are the characteristics of granite? 1. Granite has a dense structure, high compressive strength, low water absorption, high surface hardness, good chemical stability, strong durability, but poor fire resistance.

2. Granite is a fine-grained, medium-grained, coarse-grained granular structure, or a patchy structure, with uniform and fine particles and small gaps (porosity is generally, and the water absorption rate is not high (the water absorption rate is generally, and it has good frost resistance. 3. The hardness of granite is high, its Mohs hardness is about 6, its density is between g cm3, its compressive strength is 100-300MPa, of which fine-grained granite can be as high as 300MPa or more, and the flexural strength is generally 10 30MPa. Fourth, the granite has a high rate of desertion, can be processed in various ways, and the orange board is round and stuffy.

There is also granite that is not easy to weather, and can be used as an outdoor decorative stone with orange.

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Granite is characterized by its hard texture, resistance to wear, resistance to compression, resistance to fire, resistance to acids, alkalis, and corrosive gases. Most of them only have markings, a few are monochrome, the pattern changes less, easy to assemble, and the application of silver is extensive.

The usual granite is light colored, gray, off-white, light gray, red, flesh red, etc. The granite has a uniform texture and a light-colored hue with little color variation, making it suitable for large-area applications. The granite has a high reclamation rate, can be treated by a variety of processes, and the plate has good assembly performance.

In addition, granite has strong weathering resistance, and is suitable for occasions with high requirements for wind and sun, wear resistance, and high mechanical properties, such as building walls, halls with large passenger flow, stairwells, etc.

The crystalline morphology of granite also varies according to the minerals it contains, and the common ones are leaf-like, radial, spotted, etc. These different crystalline morphologies give granite its unique texture and pattern. Granite is highly durable due to its high hardness and density, as well as its good chemical stability.

It can withstand the long-term erosion of the natural environment and human activities, and is not easy to wear and corrode.

Classification of granite

The most common classification schemes are geochemical and genetic alphabetical classification schemes, such as the classification of granite into S-type, I-type, M-type, A-type, and frontally bent with C-type (S-type is granite modified from sedimentary rocks; Type I is of magmatic origin; M-type is mantle**; Type A is anhydrous granite; c stands for perilla granite).

or divided into calc-alkaline, alkaline, peralkaline, peraluminium and aluminous granite, etc.; or according to the tectonic setting is divided into "orogenic granites" (oceanic and continental volcanic arcs; continental collision zones), "post-orogenic granite" (uplift or subsidence areas after the orogenic period), and non-"orogenic granite" (continental rifts, hot spots, mid-ocean ridges, oceanic islands), etc.