What stone was used in ancient pharmaceutical factories?

Traditional Chinese medicine grinding tools generally consist of iron grinding tank and wheel grinding disk. Chinese herbal pieces for relieving pain, such as adzuki bean, Ziziphus jujuba seed and cardamom, are decomposed and shelled by pushing copper particles back and forth in a copper mill, and the Chinese herbal pieces prepared from them have good medicinal properties. Although the new generation of traditional Chinese medicine pulverizer is widely used, the ancient traditional Chinese medicine pulverizer still plays an irreplaceable role.

If stone is used, it is usually marble.