1. Yellow sand skin: refers to yellow sand skin. Among them, the yellow salt sand skin is the superior product in the yellow sand skin, with a yellow skin like salt. There are yellow sand skins at all entrances. Therefore, it is difficult to distinguish the jadeite output of the yellow salt sand crust at the entrance of the market.
2. White sand skin: refers to white sand skin. Among them, white salt sand skin is the top grade of white sand skin, with a white skin like salt.
3. Black black sand: The skin is black and covered with a layer of wax crust. Black black sand is produced at almost all entrances, but the best quality is the black black sand at the entrances of Pagan and Nanqi, which is also the crust feature of high color jadeite.
4. Old elephant skin: grayish white, wrinkled and rough, like elephant skin. It seems that there is no sand, and I feel my rough hands. There are many kinds of glass and ice jadeite, and the most are produced in Pagang, which is the shell feature of the first-class water materials.
5. Rust skin: the skin has rust color, which is produced in Changkou, Dongguo, and most of the bottom is gray. If the high color can cover the gray bottom, there is no sense of gray.