WordReference Random House Unabridged Dictionary of American English © 2017
nau•mann•ite  (nômə nīt′, nou-),USA pronunciation n. 
  1. Mineralogya mineral, silver-lead selenide, (Ag2Pb)Se, usually occurring in iron-black cubic crystals.
  • 1840–50; after Karl French. Naumann, (1797–1873), German mineralogist; see -ite1

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