The physical properties of Hetian jade are as follows:
Specific gravity: 2.9 ~ 3.1 (including more Yang Shishi, the proportion is too large)
Hardness: 5.5 to 6.5 (Mohs hardness)
Withstand voltage: 7 tons / cm2 (iron pressure is 4 ~ 5 tons / cm2)
Fracture: jagged
Streak: white
Transparency: translucent ~ opaque
Gloss: fat luster, waxy luster, silky luster, shell luster, glass luster (fat luster, glass luster and polishing method, waxy luster, silky luster, shell luster and chemical composition, distribution in jade, The structure of jade is related to the amount of water contained).
colour:
Jade color: white, yellow, cyan, bicolor, reddish brown (sugar), black
Mottled color: the color of the mineral mixed with jade
Skin color: white, red, yellow, brown, black
Coloring: different with artificial dyeing
Twilight: yellow, black, red, brown, white, green, yellow, yellow, etc.
Hetian jade identification method
Hetian jade identifies methods with scientific methods and methods of experience.
The scientific method is to carry out rock ore identification, jade fineness identification, and jade impurity component testing. Generally, collectors of love jade can't do it. The method of experience is more practical, which means that the magnifying glass can be used to determine whether it is Hetian jade, whether it is good jade or secondary jade by the naked eye, by hand, by hardness, by light.
It is now described as follows:
The weight of 掂 and Hetian jade is 2.9 to 3.1, which is heavier than the common rock (specific gravity of 2.5 to 2.7), and there is a heavy feeling of pressing hands. Experienced people can discern by hand.
The hardness of the test hardness and the field jade is 5.5 to 6.5 degrees Mohs, which can inspire the glass, and many jade-like stones often have insufficient hardness.
Listening to the sound and the structure of the jade is closer than the ordinary stone. When the blockiness and thickness of the jade, jade or jade are appropriate, the sound will be crisp and pleasing after the knock, and the jade and stone of the same shape cannot.
Sensitive temperature and Tianyu's thermal conductivity is small, heat transfer is not good, it will make people feel warm (not so cool). Generally, the thermal conductivity of quartz and carbonate rock, glass, etc. is large, and the back of the hand is tried, the jade is warm and the glass is cool.
Seeing the head of the water head refers to the transparency of jade. The content of tremolite in jade is large, the structure is fine, the impurities are less, the water is absorbed more, the transparency of jade is good, and the head is sufficient.
Look at the oil head oil refers to the degree of luster. The tremolite in jade has a fibrous interweaving structure. The polished surface is uneven. The light enters the jade and diffuses. The surface is scattered and reflected, making the jade look transparent and crystallized. It is external and bright. moist. The oil head is well related to the surface polishing. The glass light is good for the performance of the water head, and the soft light is good for the performance of the oil head. Good jade has a big oil head.
The skin color jade skin often has different skin color. The processing of the seed material sometimes leaves the color of the original skin. There are jujube red, autumn pear yellow, brown, black and white, and the skin color is jade. Leave it to match the pattern (clear color, pretty color) or prove that the product is indeed a seed material (the skin color is a major feature of the seed material). Remove the jade from the outer skin, sometimes leaving some "pine roots" deep into the jade muscles. After the ancient jade is buried, there will be a variety of twilight, and the epidermis will change color after weathering and erosion. Some jade articles have been dyed to change the original color. Some people deliberately add color to the old jade to fill the ancient jade, which will leave traces of acid corrosion and coloring, which needs to be carefully identified. The skin color can be initially determined whether it is ancient jade, whether it is a seed material or a human work color, and whether it is a fake.
Look at the surface of the orange peel on the surface of the jade. You can see it with the naked eye or with a magnifying glass, like the wrinkles, plaques and unevenness of the orange skin. Some orange peels are more obvious, and the markings are large and high, but some orange peels are very small and very thin. It is difficult to distinguish them without a high magnification magnifying glass. The formation of orange peel is due to the uneven internal structure of jade and the hardness of various parts of jade. After honing and polishing, the dense and hard part is not easy to wear and protrudes from the surface. This is because the structure of the tremolite microcrystalline fiber interweave structure causes the unevenness of the jade after polishing, which becomes a feature of nephrite. The protruding part of the orange peel is often a dense tremolite agglomerate, while the concave part is a looser part, and its wrinkled plaque and twisted special shape reflect the interwoven structure of the microcrystalline fiber inside the jade. Microscopic origin.
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