According to the conditions of its formation, we can classify nephrite into two categories: Hetian jade, East Korea, South Korea, Russia, and Hetian jade seed materials are all Class A; Hetian jade seed material produced in Guangxi and Guizhou, and other jasper in other areas belong to Class B. The high quality Hetian jade seeds are produced from high quality formations, so the origin is a very important factor. Why is it so classified? Because Hetian jade seed material is mainly composed of several elements such as H2O, SiO2, CaO and MgO, magnesium is the key to form different kinds of jade. "Dolomitic marble" is the key stratum formed by the class A Hetian jade seed material, providing CaO and MgO for the formation of Hetian jade seed material, and only the magma provides H2O and SiO2. The formation of Class B Hetian jade seed material in “Daliyan†can only provide CaO, and SiO2, H2O and MgO are provided by magma. The key magnesium element can only be derived from magma. The combination of different methods determines the quality of the jade species and jade. Among them, the key stratum is the “Dolomitic marble†which was mainly formed 1.5 billion to 2 billion years ago. Its formation is a bit difficult, and the later the geological era, the less. The key stratum advantages make Kunlun Mountain produce Hetian jade seed material. Coral Blanket,Coral Baby Flannel Blanket,Coral Fleece Blanket,Printed Coral Fleece Blanket Shaoxing Lotus Textiles Trading Co.,Ltd. , https://www.sxlotusblanket.com