bournonite

bournonite [bawr-nuh-nahyt, bohr-, boo r-] Word Origin noun Mineralogy.

1. a sulfide of lead, antimony, and copper, PbCuSbS3, occurring in gray to black crystals or granular masses.

Origin of bournonite 1795–1805; named after Count J. L. de Bournon (died 1825), French mineralogist; see -ite1 Also called cogwheel ore.