Hematite
1、 Pharmacopoeia standard of akashizhi         This product is a silicate mineral polyhydrate kaolinite of the polyhydrate kaolinite family, mainly containing aluminum silicate tetrahydrate [AL4 (si4o10) (OH) 8.4h2o]. After excavation, remove the debris.
        [character]   This product is a massive aggregate, which is irregular in shape. Pink, red to purplish red, or with red and white patterns. It is soft and fragile, and some sections have waxy luster. Strong water absorption. It is earthy, light in taste, and has no sense of sand when chewing.
          Decoction pieces
        [processing]   Remove impurities from the red stone grease, break it or grind it into fine powder.
        Calcined red stone grease take the fine powder of red stone grease, mix it with vinegar, rub it, cut it into sections, dry it, and calcine it to red through the lighting calcination method (general rule 0213). Mash when needed.
        [sexual ambiguity and tropism]   Sweet, sour, astringent, warm. It belongs to the large intestine and stomach meridian.
        [function and indications]   Astringent intestines, hemostasis, muscle growth and sores convergence. It is used for diarrhea and dysentery for a long time, stool bleeding, and metrorrhagia and leakage; The external treatment of sores and ulcers will not shrink for a long time, and the wet sores and abscesses will be soaked.
        ; 9～12g， Fry first. For external use, apply appropriate amount to the affected area after grinding.
        [note]   It should not be used with cinnamon.
        ; Keep dry and damp proof.
 

2、 Chemical composition of hematite
The main component is aluminum silicate hydrate [al4 (si4o10) (OH) 8 · 4h2o], which also contains a considerable amount of iron oxide (Fe2O3) and other substances. Its composition is as follows: silicon 42.93%, aluminum 36.58%, ferrous oxide (FeO) 4.85%, manganese 4.85%, magnesium and calcium 0.94%, moisture 14.75%. .

3、 Pharmacological action of akashizhi
. It has local protective effect on inflamed gastrointestinal mucosa and hemostatic effect on gastrointestinal bleeding. Gavage of 20 and 40g/kg of akashizhi could shorten the blood coagulation time of mice (capillary method) and the plasma recalcification time of rats, and inhibit ADP induced platelet aggregation in rabbits and rats and ADP induced platelet thrombosis in mice.