It is arsenopyrite (traditional Chinese medicine), a natural arsenopyrite ore, or made of arsenopyrite (pyrite) and realgar. ) refined products obtained by sublimation.

Materia Medica: "Put raw tobacco on the fire, cover it with utensils, make the tobacco fly, cover it with utensils, and then coagulate, but it will droop like a nipple, and the elderly will win, and the latter will be short." The big ones are inferior, and the small ones are extremely inferior, so you should be a nipple elder when taking medicine. "