The toughness of Hetian jade: It is the ability of the object to resist wear, stretch, and pressing, and can also be called the ability to resist breakage.

The so-called high toughness means that the object is difficult to crack and wear-resistant.

Among all the gemstones in the world, Hetian jade has extremely high toughness, second only to black diamond, and is the highest toughness among common gemstone varieties.

The tenacity of Hetian jade is inseparable from its unique felt-like structure.

Cleavage and fracture: Under the action of external force, the crystal cracks into a smooth plane along a specific crystallization direction (generally parallel to the direction of the crystal plane), which is called cleavage, and the smooth plane of the crack is the cleavage plane.

In gemology, the difficulty of forming cleavage and the characteristics of cleavage plane development divide cleavage into four categories: very complete cleavage, complete cleavage, medium cleavage and incomplete cleavage.

Tremolite has two groups of complete cleavage, because Hetian jade is a mineral collection platform, so the whole does not see the rational plane, and the fracture is uneven.

The popular understanding is that people will find that there are many cracked textures on the surface of jade when collecting jade, and the professional terminology says that a cracked texture of jade is a cleavage surface.

Due to the influence of crystal anisotropy, jade has uneven cracks, which have an impact on the carving of jade.

The cleavage plane is not a crushing surface, and there is no certain direction and law when crushing occurs, while the cleavage plane is regularly cracked along one or several directions, and the surface also appears flat and smooth.

I introduce these, which are difficult for ordinary people to understand, but anyone who has played with Yellow Wax Stone will know what is going on.

The store proudly introduces that Hetian jade is one of the "four famous jades in China" (the third is Shaanxi Lantian jade, Liaoning Xiuyu and Henan Dushan jade).

The traditional narrow category refers to jade produced in the Hotan region of Xinjiang, which is famous for its "sub-material", and the broad meaning of Hetian jade refers to nephrite (real jade). Although Hetian jade is named after Hotan, Xinjiang, it is not a regional concept in itself, and does not specifically refer to the jade produced in the Hotan region of Xinjiang, but the name of a class of products.

In China, the stones with more than 98% tremolite content are named Hetian jade, which are within the scope of the national standard.

When Qin Shi Huang unified China, Hetian jade was called "Kunshan jade" because it was produced in Kunlun Mountain, and later it was called "Khotanese jade" because it was located in the territory of "Khotan", until the ninth year of Guangxu of the Qing Dynasty (1883) when the establishment of Hetian Zhili Prefecture, it was officially named "Hetian jade".

The famous product in Hetian jade is the national treasure of the Western Han Dynasty "Queen's Seal" treasured in the Shaanxi History Museum, and its texture is Xinjiang Hetian sheep fat jade, which is the only jade seal of the queen of the Han Dynasty so far, and is the first batch of cultural relics that are prohibited from going abroad (territory) for exhibition. The emblem of the 2008 Beijing Olympic Games, the "China Seal", is also made of Xinjiang Hetian jade.

Hetian jade is a metamorphic rock formed by contact metasomatism between magnesia marble and medium acid magmatic rock, containing tremolite, hornblende, actinolite and other multi-mineral aggregates, the chemical composition is water-bearing calcium-magnesium silicate, the density is 2.95-3.17, and the Mohs hardness is between 6.0-6.5.

For a long time, there has been a great controversy in the academic community about whether Hetian jade is divided by origin or by mineral composition, and it was finally officially determined - "The national standard for physical samples of Hetian jade is defined according to its mineral composition regardless of the place of origin."

How about it, I'll introduce you so much, I believe you are also a jade player, just buy a few pieces to play, right?

It's not bragging, this Hetian jade is the best in Xinjiang, don't miss it when you come.

If you think the material is not fun, there are also carved pieces here, you can take a look, if you like, you will be given a discount.

"Can you introduce what the price of Hetian jade is now?"

Kowloon asked.

"You ask a good question, the old saying is good: gold is priceless and jade is priceless! And jade does not have a grade evaluation mechanism accepted by the industry like gold and diamonds, we can only estimate its price range based on experience, we do have "Hetian jade (nephrite) identification and classification, naming method (detailed rules)", Hetian jade also has its own standards, but not to mention the general consumer, that is, people in the industry, without professional and systematic learning and years of hands-on experience, how can they be distinguished? So how do you judge whether this piece of jade is worth anything?

"I told you that generally under the influence of no human carving, the value of Hetian jade is mainly determined by the comprehensive index of origin, occurrence, skin color, skin state, whiteness, fineness, oiliness, and shape.

Whiteness is not the most important indicator, now the jade market, the impact of the skin on the price is far more than white, the ancients played jade to peel, and now people play jade are playing with skin. ”

The boss took out a price comparison table: "It is easy to see the value of jade by comparing this table.

"For example, the price of Qinghai mountain material with a white grade is not as good as that of Xinjiang seed material with red skin, and the price is higher than that of Xinjiang seed material with a thick structure of 1.5 grade white without skin.

"Actually, the doorway here is too big, and I have specially compiled a table to list the details. ”

Jiulong took a rough look, good Hetian jade, such as mutton fat jade, is sold for tens of thousands per gram, and the cheap black jade, the size of a palm, is only a few hundred yuan, this is inevitably too complicated, how to choose a good one?

The shopkeeper saw Jiulong's thoughts, and hurriedly introduced how Jiulong would choose Hetian jade.

"Let me tell you how to choose materials, Hetian jade is different from ordinary commodities, its value mainly depends on the texture of Hetian jade itself, Hetian jade has five major elements

"Number one: oiliness.

"There is a saying in the industry: jade looks at the seed, and Hetian jade picks and runs.

"The so-called moist here refers to the glutinous nature of Hetian jade.

"The so-called oil glutinousness, which is expressed, is actually the delicacy and moisturization of the texture of Hetian jade.

"Second: density

"It's hard to grasp and hard to put into words.

"I usually look at the structure with a weak light on the side, and it is an exaggeration to say that the structure is not visible, and the structure is not seen only if it is fake.

"I can't see the structure inside in the natural light outside, and I think it's okay.

"Of course, the more delicate the better.

"Third: color

"The color should be as positive as possible, and the white one should not be stuffy, and it would be perfect if it didn't shine blue.

"Putting the jade on white paper is a very effective way to see white jade.

"The best of the blue is to make people feel bright.

"Fourth: purity

"Cleanliness is the second factor in the selection of products, try not to have impurities, cotton, infestation, stony (except for skillful carving).

"This is relatively easy to identify, and if it is difficult to find these with the naked eye, it is a good jade.

"If you can't avoid it, try to keep the front or important parts from being affected.

"Fifth: type (carver)

"Contains appearance, craftsmanship, size.

"Appearance, we think of the shape of all kinds of beautiful utensils in life, and by extension, the same is true of jade.