zinc-blendehttp://www.oed.com/dictionary/zinc-blende_n%3Ftab%3Dmeaning_and_usezinc-blende, n.
First published 1921; not fully revised

zinc-blendenoun

  1. 1842–
    Native zinc sulphide = blende n.
    1. 1842
      The principal ores of zinc are calamine..and zinc blende.
      T. Graham, Elements of Chemistry ii. v. 573

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

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