Medical stone is generally produced in the subvolcanic phase of residual magma in the late stage of magma crystallization differentiation, because its shape and color are like a barley rice ball.

Named after this. Medical stone is a natural medicinal ore, which was discovered and utilized 70 million years ago. It is speckled pea gravel in valley streams. In ancient China, it was called Maifanshi, which was named after its appearance resembling barley and rice balls. As early as the beginning of the 4th century AD, physicians in past dynasties had many medical books, such as Xiao Pian Fang, Illustration of Materia Medica, Hailun Lu, Illustration of Materia Medica and so on. In the Compendium of Materia Medica written by Li Shizhen, a physician in the Ming Dynasty, it is recorded that "Medical stone is sweet, warm and nontoxic. Attending to everything. " Modern science has proved that it is a kind of quartz porphyry, which looks like a rice ball, hence its name. Mainly composed of silicic acid and alumina, it contains more than 59 kinds of minerals, inorganic substances, trace elements, macro elements and trace elements necessary for human body. Because medical stone contains a variety of trace elements beneficial to human health, it has such magical effects. In particular, zinc, selenium, molybdenum, copper and other trace elements closely related to human health are high in medical stone.