Hetian jade identification look over (Figure)
Hetian jade is a collection of tremolite minerals with several remarkable features: a typical warm and even oil wax matte, translucent or opaque, Mohs hardness of 6 to 7 degrees, no knife, generally used The metal knives are scratched and the hand touch has a distinct sticky feeling. There are very few jade in the market that truly meet the scientific standards. It is recognized as Xinjiang Hetian jade. Because Hetian jade has a tremolite content of more than 95%. The top-grade Hetian white jade has a tremolite content of more than 99.5%. Because the name of Hetian Yu is outside, the output is scarce, so the market price is very high, and there are many counterfeiters.
First, use Russian jade, Qinghai jade, etc. to impersonate Hetian jade
1. Russian jade posing as a source
The mineral composition and internal structure of Russian jade are similar to those of Hetian jade. It can be identified by the following methods:
Hardness test: Hetian jade hardness is 6-7, Russian jade hardness is 5.2-5.4, and it is a few times with a small steel knife with a hardness of 5.5-6. There may be no Hetian jade.
Drip observation: Hetian jade has a high density. After dripping, the edges of the water droplets are neat and not diffuse.
Light transmission observation: The jade is directed to the bright spot, such as the sun or the light, the color is clear and the structure is even. He may be Hetian jade. Russian jade in the light-transparent place, with a slight observation of the naked eye, you can see the structure of "hair flutter".
Hand touch: Hetian jade is in the hand, touch it, touch it, feel warm and slippery; Russian jade structure is thicker, feels lighter, and has poor toughness, easy to start, that is, it is easy to appear "cracking" when engraving ", so pay attention to observe the cracking of the jade lines.
Compared with Xinjiang white jade, the texture of Russian white jade is also rough, "white" rather than "run", and some will give people a feeling of "dead white." If Xinjiang white jade is compared with Russian white jade, the former is “running†and white is delicate, while the latter is “rough†and white. Frequent sun and rain, it is also prone to smashing, cracking and discoloration.
2. Qinghai materials impersonation and field materials
Qinghai Kunlun jade is basically similar to Hetian jade. The difference between Qinghai Kunlun jade and Xinjiang Hetian jade depends largely on experience. Qinghai Kunlun jade is only mountain material, mainly white jade, most of which are large in size, neatly tidy, less lithographic, and have special varieties such as white leather, ash white, black and white jade, and the color is gray-white There is also a small amount of yellow-gray, called "rice soup"; other emerald green, smoky gray, black and other special colors; transparency is significantly higher than Xinjiang Hetian white jade, some are translucent, poor oil and fat, lack of "condensation" Moisturizing and lustrous, there are white "brain flowers", "like stone flowers", "cotton-like splitting", dark brown blemishes, "stone ribs", "stone nails", etc., with slightly lower hardness.
3. Korean material pretending to be Hetian jade
The first is to look at the color. Han Yu is mostly grayish yellow and greenish white and grayish yellow, and the small needle-like white spots can be seen with the naked eye. The transparency is poor, and the fake skin is used to fill the seed material, while Hetian jade is white and natural, gentle and soft.
The second is to look at the texture, Han Yu density and texture slightly loose, it seems that the glass is not shiny, it seems that there is a feeling of waxing, the gloss is not soft, and the real Hetian jade has a cloud-like structure of jade flower, delicate texture The gloss is warm and has a distinct oily feel.
Finally, try the hardness. The hardness of Hanyu is slightly lower than that of Hetian jade. It is a little higher than the hardness of glass. Therefore, when scoring glass, it is necessary to use some strength to draw traces, and Hetian jade gently draws on the glass. There will be traces.
4. Daiyu pretending to be Tianqing white jade
It is produced in Xiuyan County, Liaoning Province, and is another jade in China. The production of jade jade is large, the hardness is low, and it is easy to break. It is second only to Hetian jade in value. Its internal structure is cloud-like. Mainly green, mainly used to pretend to be Tianqing white jade.
In addition, quartzite jade, serpentine jade, calcite jade, Pakistani jade, Afghan jade and Hetian jade are used. These jade are not classified in terms of chemical composition, physical structure, hardness and toughness, and Hetian jade. These are basically Good difference.
At present, there is a powder on the market that uses the processed Hetian jade corner residual material or the engraving process. After mechanically pulverizing and casting, the difference is more difficult. Since the cast product has the various components of Hetian jade, it is similar to the Hetian material in hardness, gelatinization, gloss and fine texture. It is difficult to find additives in the structure without physical and chemical detection.
Second, several other common counterfeiting and Tianyu materials and counterfeiting methods
1. Daliyan jade: This jade color is white, the gloss is waxy luster, and the internal structure is waterline and stripe.
2. Milky white rock: The main component of this jade is quartzite, which has high hardness, but is brittle and easy to break. The internal structure is granular. The color is pale and the gloss looks dry.
3. Emulsified glass: This is a pure counterfeit product that is made of glass. It has no obvious structure, and it is visible to the naked eye that there are bubbles inside.
4. Artificial imitation: Since there is no mineral composition and physical properties of Hetian jade, there is no optical reaction under the test instrument, and the authenticity is known once it is identified. There are also fake methods such as dyeing, tingeing, enriching, brightening, making old, antique, etc., and more comparisons can be distinguished. Artificial imitations are inexpensive. The artificial imitation of Gaoming will also leave traces. When it is identified, it can be compared with the characteristics of Hetian jade: the artificial imitation is uniform and pure white, and there is a feeling of stagnation. There is no warmth and no radiance of Hetian jade. Lack of elf feeling, natural Hetian jade "no flaws" are few, artificial imitation products are difficult to make natural flaws, such as stone, there are often bubbles, shell-like fracture, feel light, hardness, such as the hardness of plastic makers Lower, especially for articles that are made from heavy powder, use a sharp iron to scrape off the surface and scrape off the powder.
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