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bournonite

[bawr-nuh-nahyt, bohr-, boo r-] /ˈbɔr nəˌnaɪt, ˈboʊr-, ˈbʊər-/
noun, Mineralogy
1.
a sulfide of lead, antimony, and copper, PbCuSbS 3 , occurring in gray to black crystals or granular masses.
Also called cogwheel ore.
Origin
1795-1805
1795-1805; named after Count J. L. de Bournon (died 1825), French mineralogist; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for bournonite

sulfosalt mineral, a lead, copper, and antimony sulfide (PbCuSbS3), that occurs as heavy, dark crystal aggregates and masses with a metallic lustre in association with other sulfur-containing minerals in many locations, including the Harz Mountains of Germany; a number of localities in Italy; Bolivia; Peru; Ontario, Canada; and the western United States. Its crystals have orthorhombic symmetry. For detailed physical properties, see sulfosalt (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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