Smithsonite, or zinc spar, is zinc carbonate, a mineral ore of zinc. Historically, smithsonite was identified with hemimorphite before it was realised that they were two distinct minerals. The two minerals are very similar in appearance and the term calamine has been used for both, leading to some confusion. It is an astringent and antiseptic. Zinc carbonate is used as a pigment in the manufacture of porcelain, pottery, and rubber.
Zinc Carbonate
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