一石决明石决明別名九孔螺、千里光、鮑魚壳,是軟体动物鮑科(Haliotidae)动物盤大鮑(Haliotis gigantea discus Reeve)或其他种鮑魚(如南海产之耳鮑、杂色鮑等)的干燥貝壳,有明目、疗瞖障之效。其貝壳內之肉,名鮑魚肉,是名貴的食品。宋朝苏頌描写石决明的外形說:“……决明壳大如手,小者如三兩指大,可以浸水洗眼, A stone Cassia cassia alias nine hole snail, Senecio, abalone shell, is the mollusc Hakootidae animal abalone (Haliotis gigantea discus Reeve) or other species of abalone (such as the South China Sea ear abalone, variegated abalone, etc. ) The dry shells have eyesight and healing effects. The meat inside its shell, abalone, is a valuable food. In the Song Dynasty, Su Song described the shape of the stone cassia. He said: "... The casket shell is as large as a hand, and the small one is as large as three fingers, and it can be soaked in water and wash eyes.