Gypsum jade is Fei Xiangyu, whose scientific name is anhydrite jade. Its properties are relatively stable at high temperature, and there is almost no water and volatile matter. It is a new kind of jade that has recently appeared in the jewelry market. This kind of jade is produced in Kashgar, Xinjiang, where there is snow all the year round. The special terrain and climate have formed Fei Xiangyu's five qualities of "white, moist, pure, soft and dense". At the same time, it also has the quality of "warm, moist, frozen, fine and greasy" by Liu De.

The forming conditions of jade are extremely special and complicated. Most of them come from high-temperature molten magma tens of kilometers underground. These high-temperature mud rushed from underground to the surface along the cracks, and turned into hard stones after cooling. In this process, only some elements slowly crystallize into hard jade or precious stones, and their formation time is very far away from us.

Jade and jade are somewhat confused. Early and now, people confuse jade with jade and use it equally. Up to now, there is no distinction between ordinary people and craft circles and strange stone circles. But academic circles tend to separate jade from jade, and jade refers to jadeite and nephrite; Jade, as a general term, includes jade and gems composed of mineral aggregates with jade-like appearance.