Crystal stone, or Chinese stone(of course in Iran), are calcareous or dolomitic rocks that have been recrystallized by intrinsic factors, such as temperature and pressure, and are therefore metamorphic rocks.
Chinese rocks in different places differ in terms of metamorphism and some chemical constituents.
Chinese stone often has large crystal stones. These large crystal stones distinguish Chinese rock from sedimentary carbonate rocks.
In terms of the internal structure of the rock and the crystallization of the rock, one mine is different from another.
Calcite is the main mineral that forms most of the Chinese rocks.
Chinese rocks also contain minerals such as quartz, graphite, hematite, Simonite, perite, and so on.
In some Chinese rocks there is quartz, which increases with increasing hardness.
If the stone is perfectly pure, it is white and luminous. The color of light gray to black indicates the presence of carbonaceous materials. Green dyes are usually produced by chlorite or other silicates.
The pink and red color is due to the very scattered particles of hematite or manganese carbonate and the yellow and cream color due to the presence of limonite.
Water absorption in porcelain or crystalline limestone is usually less than 1%. Its specific weight is 2.7 ton / m3.
In terms of strength, Chinese rocks are of medium strength. Chinese rock has a resistance between nineteen to one hundred Megapascals. Its average compressive strength is about 100 MPa.
Its flexural strength is between six and 15 MPa and its tensile strength is about 4 MPa. The porosity of this rock is very low, ranging from 0.3 to 1.2 percent.
Building facade – crystal stone.
Exterior crystal stones:
The use of crystal stone for the facade and exterior is completely technical and correct. Chinese stone is water absorbent and slurry adhesion between granite and travertine.
In Iran, the use of this stone for the facade has long been common. If you are careful, Chinese stone is the main facade of many old buildings, especially in the tropical regions. Because of its light color, it does not absorb much heat and the building is protected from excessive heat.
Its resistance to surface and deep weathering is moderately good and reliable. In some mines, Chinese rock can compete with travertine and granite.
The Oslo Opera House in Norway is a great example of this stone being used externally. It is an important architectural building near the sea and some of it is submerged in water and has the idea of forming an icy mountain from the sea. It has come out. Due to the extremely low temperature the sea temperature in Norway is always below zero.
The choice of this stone on the one hand helped to convey the white color of the ice. On the other hand the good resistance of the stone allowed it to be used in such an environment.
Of course, to prevent slippage, the stone is completely bush hammered.
To ensure the strength of the stone during its long and long life, they used a thicker stone, eight centimeters. The whole stone is also installed dry.
The whole building is very beautiful and attractive. The ornament of this masterpiece is the Chinese “karara” stone, one of the most famous Chinese stone mines in the world. It can also be used for stone artifacts.
Even Cubic is used like Granite cubic and Travertine cubic. Chinese stone table can also be useful and beautiful. For example, its use in the Vali Asr Street Pavement and Atmospheric Reconstruction project is completely in place.
In this design, all of the street tables from Tajrish Square to Tehran Railway Square are made of unpolished Chinese stone, which have been partially tiled and partially overhauled.
In some parts of the floor, Granite cubic has been used, and in some parts they have used Chinese cubic.
Indoor Chinese stone:
The use of stone in construction is based on various factors, one of which is the fashion items. In a word, Chinese stone is not fashionable for the interior right now.
Part of it goes back to the fact that Chinese rock is white, neutral, and cold. The interior needs warmth and charm, and this stone is not what matters to the designer.
Another reason is that the stone is processed by low quality cutting and milling factories and we are accustomed to seeing Chinese stone with poor processing quality and more in dimensions of twenty centimeters long and in substandard locations.
This is an important psychological factor that minimizes the demand for Chinese stone indoors. But in the future it may be re-fashioned with good processing and in large dimensions and be able to take on a new position for itself.
Perhaps the lucky thing that happened in recent years for travertine would be for Chinese stones.
This has happened in recent years for the Lash Rock. This stone was always used bush hammered at a low price. There were some who bought a large block of good timber, got slabs, processed it well and exported it.
The domestic market began to realize its worth, and after years as a decorative stone, it opened up for itself and demand for it increased.
In this regard, synthetic veins of Chinese stone can greatly help attract more designers and consumers.
If the story of the book match, such as marble and travertine, is used in the processing of Chinese stones (this is possible) it could soon become a valuable commercial stone from a low-priced stone.
Visiting a European exhibition – particularly Verona – can be seen with such a perspective. See how a “karara” porcelain stone and the like make beautiful, memorable, and worthwhile uses of this stone. They were able to revive the Chinese stone so beautifully. The use of Chinese stone for painting 3D cnc stones is also very attractive.
What kind of stone should we use if we were to expect a thin stone with good resistance and not too rigid and unprocessed?
What should we use if we were to engrave on a rock and expose it to snow and rain and not require serious processing like travertine? The answer is clear; it is Chinese stone!
This can be interesting for designers who are authors or designers themselves. It is not bad for the miners to note that one day crystal stone may be fashioned again. Because he has both his merit and his background.
crystal stone is cut by soft stone cutting machines and usually does not require special lace and resin, as it has very low porosity and empty veins.
The phenomenon of light passing through stone is a very attractive phenomenon in traditional and modern architecture, although this phenomenon is specific to marbles and will be discussed in the future.
But some Chinese stones have this feature. And the Chinese stone in this property partly shares marble stone. That has affected the marble‘s superiority to a very small extent.