Zinc carbonate is usually applied in treatments for patients with skin problems. They are applied in light and astringent latex products. Carbonate is also used as a raw material for the production of rayon, a compound used in the field of chemical fertilizers and pesticides. Zinc carbonate is the inorganic compound with the formula ZnCO3. It is a white solid that is insoluble in water. It exists in nature as the mineral smithsonite. It is prepared by treating cold solutions of zinc sulfate with potassium bicarbonate. Upon warming, it converts to basic zinc carbonate (Zn5(CO3)2(OH)6).