Medical stone is a kind of compound mineral or medicinal stone which is non-toxic and harmless to organisms and has certain biological activity. The main chemical composition of medical stone is inorganic aluminosilicate. It includes silicon dioxide, aluminum oxide, iron oxide, magnesium oxide, calcium oxide, K2O, sodium oxide, titanium dioxide, phosphorus pentoxide, manganese oxide and so on. It also contains all macro elements needed by animals, such as trace elements such as K, Na, Ca, Mg, Cu, Mo and rare earth elements, with about 58 species.
Experts at home and abroad have identified that medical stone is rich in various trace elements necessary for human body, which can be used for water purification and sewage treatment and has a strong adsorption effect on bacteria. Drinking medical stone water can regulate the metabolism of the body, and has the functions of invigorating stomach, diuresis, protecting liver and preventing aging, which is of great benefit to human beings.
Especially in Compendium of Materia Medica, medical stone is mentioned, saying that there are many good things. However, it is said in Materia Medica that the curative effect of medical stone is only such a "full carbuncle back". That is to say, there are poisonous sores on the back, which can be made into mud paste with medical stone for external use.