Friends who play jade know that the quality of a piece of jade is generally judged from five aspects: texture, hardness, transparency, specific gravity and color. What is the hardness of Hetian jade?
Hardness refers to the ability of jade to resist external forces (such as pressing, engraving, grinding). The higher the hardness, the more difficult the processing and the better the quality of the jade. Hardness is also scored in hardness and compressive hardness.
Hetian jade
Scratch hardness is the ability of an object made of a hard substance to form a scratch on another object made up of a softer substance. The compressive hardness, also called indentation hardness, refers to the ability to resist external impact, also called toughness in the jade industry. Among all the jade species in the world, Hetian jade has the highest toughness. If it has a compressive hardness of 1000, a jadeite is 500, a jadeite is 250, and an agate is only 5. Hetian jade has such high toughness that its crystal distribution is woven like a blanket, and the interaction between molecules is enormous.
Hetian jade
In practice, jade craftsmen usually look at the jade by observing the cornice. Generally, a small piece is cut and broken with a small hammer to observe the fracture. The toughness is relatively glassy. The toughness of the jade is not easy to break, even if there is a fracture, the fracture is uneven; and the glassy jade fracture, through the section of the light, called "bright", similar to the shape of the shell. The jade between toughness and vitreousity is usually called "badness" and "meat", and its mouth is granular, parallel bundle, needle, and so on. Through this observation, it is also possible to observe whether the jade has cleavage characteristics, such as cleavage or crack, and the jade will break in the direction of cleavage or crack when struck.
Hetian jade
Therefore, it can be seen that the jade with excellent toughness, Hetian jade, is very malleable during processing. Among the jadeites with the same Mohs hardness or higher than the Mohs hardness, Hetian jade in the engraving process, the inscription line It will never rise and collapse, so its texture is fine and warm. Of course, the toughness hardness is also affected by the impurities of jade. The hardness can also be understood by measuring the toughness hardness. This is a relatively large factor in determining the use of a piece of jade. For example, the requirements for the impurity of jade and jade are not Very strict, but to make jewelry jade, it requires pure and uniform jade.
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