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Meaning of tetradymite

te•trad•y•mite

Pronunciation: (te-trad'u-mīt"), [key]
— n.
  1. a mineral, bismuth telluride and sulfide, BiTeS, occurring in soft-gray to black foliated masses.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.