Maifan stone is a neutral alkali semi-igneous rock, close to volcanic rock. Medical stone is particularly effective in removing various chemical toxins. Medical stone can also use its own components to ionize toxic substances through absorption and decomposition. Releasing minerals and balancing mineral quantities, medical stone is able to emit various minerals essential to the human body in the water. Medical stone can balance mineral quantities by absorbing excess minerals or releasing minerals to replenish deficiencies. Various trace elements released by medical stone such as potassium, phosphorus, iron, sulfur, manganese, magnesium, etc. These substances play an important role in the synthesis of enzymes and hormones. The reason why medical stone releases a variety of minerals is that it is composed of more than 24,000 ingredients. This is the most significant feature of medical stone.

The main producing areas of medical stone are Inner Mongolia, Fuxin, Liaoning, Shandong (mainly distributed around Mengyin County, Yimeng Mountain), Heilongjiang (mostly distributed in Qiqihar Nianzi Mountain), Xinjiang, Henan, Hebei and the south some areas. Reserves vary from place to place, with the largest reserves in the north.