zinc-carbonatehttp://www.oed.com/dictionary/zinc-carbonate_n%3Ftab%3Dmeaning_and_usezinc carbonate, n.
First published 1921; not fully revised

zinc carbonatenoun

  1. 1851–
    1. 1851
      The precipitated zinc-carbonate is washed..by subsidence and decantation.
      H. Watts, translation of L. Gmelin, Hand-book of Chemistry vol. V. 9

Originally published as part of the entry for zinc, n.

zinc, n. was first published in 1921; not fully revised.