Hetian jade is translucent, oily and shiny after polishing, and its hardness is between 5.5 and 6.5 degrees. Lantian jade, one of the earliest jade species developed and utilized in China, has a history of more than 5,000 years and was exploited and utilized as early as the Neolithic Age.
Dushan jade, also known as Nanyang Jade or Henan Jade, is produced in Dushan in the north of Nanyang City, and is also called Duyu for short. Xiuyu is produced in Xiuyan, Liaoning Province, China, and it is named because it is mainly produced in Xiuyan, Liaoning Province. Jade is a kind of nephrite, which belongs to serpentine. The main features are hard texture, colorful, warm luster and fine texture.
Characteristics of four famous jade
Hetian jade: The mineral composition of Hetian jade is mainly tremolite actinolite, and contains a small amount of diopside, serpentine, graphite, magnets and other minerals, forming different colors such as white, turquoise, black and yellow, most of which are monochromatic jade, and a few are variegated.
Lantian jade: lantian jade belongs to serpentine diopside. X-ray diffraction analysis shows that minerals mainly consist of serpentine marble, tremolite, olivine, turquoise, diabase and brucite.
Dushan jade: dushan jade is tough and dense, delicate and soft, with transparent luster and many-hued color. There are six pigments, including green, white, yellow, purple, red and white, and 77 color types, which are the first-class raw materials of jade carving.
Xiuyan jade: Its texture is moist, crystal clear, delicate, firm, transparent and colorful, and it has been valued and cherished by people since ancient times. It is formed in the metamorphic marble of magnesia carbonate rock, and its appearance is turquoise or yellowish green, translucent, waxy luster after polishing, and its hardness is 3.5 to 5 degrees.
Reference to the above content: Baidu Encyclopedia-Four Famous Jade in China