Donkey gemstone, belonging to the calculus category, has the effect of clearing heat and detoxifying, as well as purging fire. Its medicinal value is introduced in both "Compendium of Materia Medica" and "Great Chinese Dictionary of Traditional Medicine." Donkey sand, also known as donkey gemstone, has high medicinal and collection value, and is extremely rare in plain areas. It was initially formed in the stomach of donkeys...