bournonite

[ bawr-nuh-nahyt, bohr-, boo r- ]
/ ˈbɔr nəˌnaɪt, ˈboʊr-, ˈbʊər- /

noun Mineralogy.

a sulfide of lead, antimony, and copper, PbCuSbS3, occurring in gray to black crystals or granular masses.
Also called cogwheel ore.

Origin of bournonite

1795–1805; named after Count J. L. de Bournon (died 1825), French mineralogist; see -ite1