珍珠为珍珠贝科动物珍珠囊中所生成。其常用的有 :珍珠及珍珠层粉 ,均含钙质 ,主要为碳酸钙 ,天然珍珠含91.72 % ,养殖珍珠含 94.70 % ,还含有机物等。珍珠的加工炮制方法 ,自古就有与豆腐同煮之说。湖北省炮制规范记载的炮制方法 :将珍珠洗净 ,用布包好 ,加豆腐 (或煮豆浆水 ) Pearls are produced in pearl bequizoum capsules. Its commonly used are: pearls and nacre powder, both containing calcium, mainly calcium carbonate, natural pearls containing 91.72%, 94.70% of cultured pearls, also contains organic and so on. The processing method of pearls is said to have been cooked with tofu. The processing method recorded in Hubei Province’s concocted specifications: Wash the pearls, wrap them with cloth, add tofu (or boiled soybean milk)