I know Hetian jade! But does anyone know about Hetian Qingyu? Although the value of Hetian Qingyu is lower than that of Yangzhiyu, it has won a large number of favored eyes by virtue of its own advantages. Today we will talk about how the level of Hetian Qingyu is divided!
Characteristics of Hetian Qingyu
First, the tremolite content is extremely high
Generally, it is more than 95%, of which white jade is 99%, white jade is 98%, and sapphire is 97% (95% to 99%). The content of Hetian jade in the same type of tremolite jade in China and abroad is relatively high. Second, there are very few impurity minerals. Usually 1%. 3%, mostly around 1%. Third, the mineral has a very fine particle size and is microscopic and cryptocrystalline. The tremolite minerals are fibrous, needle-like, and leaf-like under a polarizing microscope, and are long columnar and short columnar fibers under a transmission electron microscope. The fineness of the particle size is rare in the same type of tremolite jade at home and abroad. Fourth, the structure is typical of felt, the particle size is uniform, and it is interwoven into a felt. This is an important reason for the fine and dense texture, and this structure is rare for other types of jade.
Second, the texture is delicate and gentle
The texture is a comprehensive representation of the quality of the jade, including shape, degree of moisture, cracks, impurities and so on. Due to its mineral composition and structure, Hetian jade has determined its texture. The performance is as follows: First, because of its extremely fine grain size, the texture is very delicate, which is what the ancients called "small and sorrowful", which is beyond the reach of other jade. The second is warm and moist, that is, it has the luster of oil (fat), giving people a sense of moisturizing and softening. It is the so-called "warm and moist" of the ancients. The sheep fat jade is famous for its jade moisturizing like sheep fat. Third, there is moderate transparency, that is, “the head is goodâ€, it is slightly transparent, and the jade pieces that are formed are watery and angry. Fourth, there are very few impurities, and some reach the level of innocence, and the inside and outside are the same. It is what the ancients called "there is no cover, and Yu does not cover up", or "the outside world can be known."
Third, the hardness is relatively large
Hardness is one of the important standards of jade quality. When the hardness is large, the jade has good polishing property, good brightness and long-term preservation. Therefore, in the past, the process industry has divided hardness into high-grade jade. Hardness is an important indicator. Generally speaking, high-grade jade has a high hardness and low-grade jade has a low hardness. The hardness of Hetian jade is determined to be 6.5-6.9, which is similar to jadeite, and is smaller than serpentine jade (hardness is 2-6, generally about 4) and pyrophyllite (hardness is generally low, generally 2.5~). 4) is high. Dushan jade, hardness is similar to Hetian jade, but the texture is not as good as Hetian jade.
Fourth, the toughness is extremely
Toughness is extremely important for jade, and its toughness is large, it is not easy to break, and it is wear-resistant. It has great benefits for the artistic shape and fine carving of jade.
Toughness is the hardness of impact, and some hardness is very high. For example, the hardness of black diamond is 10, and the hardness of crystal is 7, but the hardness is low, and it is broken. However, the strength of Hetian jade is not as high as that of diamond and crystal, but the hardness is very high. According to the determination, Hetian jade has a compressive strength of 6542 kg/cm 2 , which means that, for example, crushed Hetian jade, a pressure of about 6.5 tons per square centimeter must be applied; and crushing steel requires only 4 to 5 tons. pressure.
The toughness is the grinding hardness, and the Hetian jade is a tremolite jade, and its toughness is its characteristic. According to the toughness data of the world's gemstones, black diamond is 10, tremolite jade is 9, emerald, ruby, sapphire is 8, diamond, crystal, aquamarine is 7-7.5, olivine is 6, emerald is 5.5, citrine, moonstone is 5, opal is 3, fluorite is 2. For example, the toughness of tremolite is 1000, and the relative toughness of other jade or minerals is: jadeite 500, serpentine (such as jade) 250, quartzite 10-20, quartz 5, corundum 2-3, mica 2. It can be seen that the toughness of tremolite jade is the largest in jade, and it is the most important feature of Hetian jade, which is unmatched by other jade.
Five, the color is pure, there is a rare treasure of the world
The color of jade is very important for process identification, including color, color, and color. Jade has a variety of colors. People's pursuit of jade color varies with the times. For example, in ancient China, cyan was popular in the "three generations". The spring and autumn warring States began to popular white in various generations, and the emerald green became popular in the late Qing Dynasty.
The world's amphibole jade color is basically white, blue, yellow, black, blue (green) 5 colors, and some intermediate transition colors. Because of the low iron content, Hetian jade is basically the first four colors, namely, there are four categories of white jade, sapphire, topaz and ink jade, and can further classify varieties, such as white jade, white jade, white jade and so on. The amphibole jade in the ultramafic rock contains actinolite, which is high in iron and basically green, that is, jasper.
The color of Hetian jade is compared with other jade. The main features are as follows: First, the color is pure, as the ancients said: "Yellow is like steamed chestnut, white is like cut-off fat, black is like pure paint, and it is called jade." Second, there is sheep fat jade. This is the unique beauty of Hetian jade. People call it "the essence of light, body such as gelatin, firm and delicate, thick and warm, admire can be nourishment, exorcism and sorrow, good for people, beautiful." The third is jade. Since ancient times, we have attached great importance to Daiyu. Song Yingxing, a scientist of the Ming Dynasty, said: "The jade in the middle of the jade, there are those who have no cross-cutting ruler. The ancient emperor took it as a beggar. The so-called Liancheng is not easy to get. The five or six inches of innocent people are treated with cups. It is also a treasure." The skin of Hetian jade jade can be divided into three categories: color skin, sugar skin and stone skin. The color skin is a layer of jade with a thin tan or brown skin (about 1 mm thick), which is caused by oxidation. The quality of jade, such as autumn pear, tiger skin, deer skin, etc., can be seen from the skin color. Often the finest white jade. The outer skin of sugar jade is thicker, such as brown sugar, and the jade mine often has such jade, including white jade or sapphire. The stone skin is surrounded by stone surrounding rock. It is necessary to take the surrounding rock to obtain jade. For example, Heshi is a "treasure of the skin."
Six, beautiful sound
The sound of jade after being hit, this is an important property of the ancients to identify jade. The jade made by Hetian jade, the sound that is made when knocking is clear and long, such as the sound of the golden gongs, and the resounding, the residual sound is far away, and Xu Xufang does. This is what Yudezhong said, "This sounds, the Qing Dynasty is long, and its end is stunned." This feature, other non-Xinshi jade is too late.
Hetian Qingyu's grade classification
Any kind of jade has advantages and disadvantages. Hetian jade as a natural jade variety can be divided into three grades in terms of its quality.
Level 1 Hetian Qingyu:
To reach this level of Hetian Qingyu, the resources are very precious. The color of the first-class Hetian Sapphire is mainly cyan, and the overall appearance is soft and oily. Of course, its texture is definitely fine and flawless, not only can be a good jade carving, but also a favorite of the collection.
Second-level Wada Sapphire:
We said above that the first-class Hetian Qingyu is mainly composed of cyan, and the second-level Hetian Qingyu is slightly green and yellow in the cyan. It may not be as pure as Tian Qingyu in the color, but the whole jade oil is still good. The biggest shortcoming is that it contains some asbestos, chapped, impurities, etc., which affects its value to some extent.
Third-level Hetian Qingyu:
The grade has reached the third grade, and the jade of Hetian Qingyu is not considered high quality. Not only is the color mixed in the color, but the gloss is not oily, it looks dry, like waxy luster. The texture is far less delicate than the first and second grades, and the presence of cockroaches such as cracks and impurities is also a common condition.
These are the materials compiled by Xiaobian about the classification of Hetian Qingyu. I don't know if you can have a better understanding of Hetian Qingyu. At the same time, this also reminds us that when buying Hetian Qingyu, we must be careful and master the relevant knowledge to avoid falling into the scam.
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