Zinc carbonate occurs in nature as calamine.
When NaHCO3 is added to Zinc sulphate solution, ZnCO3 is obtained.
ZnSO4 + 2NaHCO3 → ZnCO3 + Na2SO4 + H2O + CO2↑
i) It is used in making ointment for curing skin diseases.
ii) It is used in the preparation of cosmetics.
iii) It is used a pigment for rubber.