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1) Name: Ma Shi pearl shell.
2) Source: Shellfish.
3) Efficacy: Remove heat, enhance the eyesight.
4) Main rule: The brain of governance disturbing, headache, vertigo, panic pull, cataracts, sciatica.
5) Effective interest: Wind, heat, and pain, sciatica.
6) Can be used as good material for making buttons. The buttons made from Ma Shi pearl shell are mostly silver luster, showing a strong positive light blue, dark green, rainbow luster, with thin texture and is hard.
7) Can also be used as material for handicrafts.