1. Composition and structure: afghanistan jade is mainly composed of calcite and dolomite, which belongs to carbonate jade and is a kind of jade marble. Its endosperm is granular, layered or banded, and it feels rough. Hetian jade is mainly composed of tremolite and actinolite, which belongs to nephrite. Its endosperm is cloud-like in texture and feels delicate and moist.
2. Density and hardness: afghanistan jade has a density of no more than 2.70g/m3 and a hardness of 5. It is light and soft, and it is easy to carve marks on its surface with sharp metal objects. Hetian jade has a density of about 2.95g per cubic meter and a hardness of 6-6.5. Therefore, Hetian jade with the same volume is obviously heavier than afghanistan jade, and it is difficult to leave traces on the surface.
3. afghanistan jade is a kind of colored carbonate jade, also called carbonate jade or calcite jade. In the jewelry industry, afghanistan jade is sought after for its unique color, clear texture and certain hardness. There are various colors, from light green to dark green, from white to light gray, among which jade with slight green or white is especially precious. Hetian jade, known as one of the "Four Famous Jade in China", has a profound cultural background and historical background. Its traditional narrow category refers to the jade produced in Xinjiang and Tian, which is famous for its "secondary materials". However, Hetian jade in the modern sense is not limited to geographical concepts, but refers to the name of a product whose main component is tremolite. As long as tremolite accounts for more than 98%, it is regarded as Hetian jade.