Lu Gan Shi
Smithsonite (ZnCO₃)
☯ TCM Properties
Clears toxins and brightens the eyes; Brightens the Eyes and Removes Visual Obstructions; Dries Dampness and Stops Itching; Promotes Tissue Regeneration and Heals Sores; Stops Bleeding
Botanical Description
Lu Gan Shi is the traditional Chinese pharmacopoeial name for smithsonite, a zinc carbonate mineral with the formula ZnCO3 that forms in the oxidized zones of zinc sulfide ore deposits. It typically occurs as botryoidal, reniform, or stalactitic masses rather than as well-formed crystals, and may also appear as earthy crusts or compact granular aggregates. Colors range from greyish-white and pale yellow to greenish-blue, pink, and brown depending on minor impurities of copper, iron, cobalt, or cadmium; the medicinal grade is usually a pale greyish-white to yellowish-white. The mineral has a hardness of about 4 to 4.5 on the Mohs scale, a vitreous to dull luster, and a brittle fracture. For medicinal preparation the raw mineral is calcined, then quenched and levigated to yield a fine, soft, slightly gritty powder.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| poultice | As needed | Daily | — | — | — |
Cultural & Historical Context
Traditional Chinese Uses
Lu Gan Shi (smithsonite, calamine) is a cold, sweet mineral substance used in Chinese medicine primarily as a topical remedy for eye conditions and inflammatory skin diseases. Applied externally, it clears Liver Heat from the eyes, reduces redness, and relieves eye pain and inflammation. For skin conditions, it absorbs moisture, cools inflammation, and dries weeping lesions — making it important in formulas for eczema, sores, and itching skin. Internally it clears Liver Heat for certain eye conditions.
Traditional American Uses
None Documented
Important Disclaimer
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.