Dictionary  bour•non•itePronunciation: (bôr'nu-nīt", bōr'-, boor'-), [key] —n. Mineral. a sulfide of lead, antimony, and copper, PbCuSbS3, occurring in gray to black crystals or granular masses. Also called cogwheel ore. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
|
Atlas
Encyclopedia
Dictionary
Thesaurus
Day in History
