They are all jade, so why are they divided into “old type” and “young type”?

The "type" of jade refers to its fineness, density, transparency and hardness.

Well, today Jiamo will talk about these four elements separately. In the past two days, many friends in the circle of friends have asked me privately, jade is made up of individual jadeite minerals, and the fineness, density and hardness of these jadeite crystals should be the same, so why should they be divided into "old type" and "young type".

Jadeite crystals have the same hardness, density and refractive index, but the situation is different for aggregates formed by a large number of jadeite crystals. After all, the crystals have different degrees of crystallization, sizes and shapes, and there are various characteristics between their bonding processes, which results in different physical properties of their aggregate as a whole.

Therefore, the quality of jade depends on its fineness, density, transparency and hardness, rather than the physical properties of the crystals that make up the jade.

Fineness. Fineness, as the name suggests, refers to the size and coarseness of the jadeite particles that make up jade. People in the industry call it "coarse flesh, fine flesh, or very fine flesh and very coarse flesh." Generally speaking, jade with coarse flesh is tender, while jade with fine flesh is old. To understand this fineness, we can compare the jadeite jadeite particles to millet and soybeans. When millets are piled together, what we see is a whole, but when soybeans are piled together, what we see is the soybeans and the spaces between them.

If the average particle size (diameter) of jadeite particles is less than one millimeter and has a microcrystalline structure, the type of jade is relatively old, such as ice type and glass type. If the jadeite grains are large like beans and present a coarse crystal structure, this type of jade is relatively tender. Usually this type of jade is called "bean type". Bean type jade is also a common type of jade.

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