The chemical formula for zinc carbonate is ZnCO3. Zinc carbonate is also referred to as zinc monocarbonate, zinc spar and natural smithsonite. It is an odorless compound, insoluble in alcohol and ammonia and soluble in diluted acids.
In its natural form, zinc carbonate appears as a carbonate mineral called smithsonite and features a color that may vary from white or gray to green, blue, pink or purple. Smithsonite is grinded to obtain zinc carbonate powder but may contain small amounts of cadmium, as data from the National Institutes of Health indicates. It is uncommon for the naturally occurring zinc carbonate mineral to appear in the form of crystals. Most of the time, smithsonite appears as an earthy compact mass.