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bournonite

[bawr-nuh-nahyt, bohr-, boo r-]
noun Mineralogy.
  1. a sulfide of lead, antimony, and copper, PbCuSbS3, occurring in gray to black crystals or granular masses.
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Origin of bournonite

1795–1805; named after Count J. L. de Bournon (died 1825), French mineralogist; see -ite1
Also called cogwheel ore.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018