what is medical stone

Medical stone is one kind of compound mineral or officinal rock with inno-cuous and innocuity, with neutral or acidic magma rock.
Besides common element, it's chemical component contains Ca, Mg, Si, Al, Fe, K, Na also a few of rare element, lanthanon, radioelement, Medical stone has the ability of absorption, dissolving, adjusting pH capability, biology activith and mineralized quality, it can absorb metal hydronium in the water, for it contains 15% of AL203, it is the typical amphoteric oxide which will react when meet alkali in the liquor to reduce pH, and will react when meet acid in the liquor to increase pH, it's has bidirectional adjustment to pH, after being dunked, medical stone will dissolve out usual element K, Na, Ca, Mg, P, and rare element Si, Fe, Zn, Cu, Mo, Se, Mn, Sr, Ni, V, Co, Li, Cr, I, Ge, Ti and so on.