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Bournonite

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bour⋅non⋅ite

  [bawr-nuh-nahyt, bohr-, boor-]
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–noun Mineralogy.
a sulfide of lead, antimony, and copper, PbCuSbS3, occurring in gray to black crystals or granular masses.
Also called cogwheel ore.

Origin:
1795–1805; named after Count J. L. de Bournon (d. 1825), French mineralogist; see -ite 1
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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Encyclopedia

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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