Montmorillonite comes form natural montmorillonite ore. It is made by refining processing according to medical standard. It is white powder、non-poisonous and tasteless. Its content 95-98 percent of Montmorillonite, 56% of SiO2,15-16% of AI2O3. It contains 15.17-15.22Å of d(001),1.49-1.50Ad(300) using the method of X-ray power diffractionn.It contains less than 8/10 of heavy metal ions. Less than 8×10^-6of heavy metal ions. Less than 2×10^-6 of arsenic (As) and no chlorine(cl) ions. Its coefficient of expansion is 10—15 and fully accords with the standard of montmorillonite medicine. The result of pharmacology and testing shows that montmorillonite in lnner Mongolia is high in degree of purity, magnesium(Mg)ions and electric charges on the surface and therapeutic effect is much better than the other montmorillonite products at home and abroad. It has special effect on treating dysentery, enteritis, colitis, chronic gastritis and atrophy of the stomach...