What mineral is Chinese herbal medicine mirabilite? How is it formed?

tooth nitrate, also known as "flame nitrate" or "saltpeter". The main component is potassium oxide, which is white crystal.

Glauber's salt is orthorhombic nitrate powder produced in dirty and damp places, walls and rock surfaces, which is formed by melting, filtering out impurities and recrystallizing. The first edition of Shennong's Classic of Materia Medica, with other nicknames such as saltpeter, silver nitrate, flame nitrate, earth nitrate, turned stone and water stone. The traditional function of mirabilite is to promote diuresis and diarrhea, and to attack and break accumulation. For example, in Shennong Materia Medica Classic, it is "to treat the accumulation of heat in the five internal organs, the bloating will be closed, the accumulated diet will be washed away, the innovation will be promoted, and the evil spirits will be eliminated."