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cogwheel ore

noun, Mineralogy

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 of bournonite
1795-1805
1795-1805; named after Count J. L. de Bournon (died 1825), French mineralogist; see -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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