... the "medical stone"which can complement the human body necessary for potassium, sodium, calcium, magnesium, constant element phosphorus and ... electron microscope,it is a sponge-like porous, its surface area is very large, and therefore has a ... used in health care, food, beverages and water purification, sewage treatment, anti-corrosion, anti-odor, preservation, decontamination, porcelain production ...