Jisho

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Noun
1. bournonite; berthonite; cogwheel ore
Wikipedia definition
2. BournoniteBournonite is a sulfosalt mineral species, a sulfantimonite of lead and copper with the formula PbCuSbS3. It was first mentioned by Philip Rashleigh in 1797 as an ore of antimony and was more completely described in 1804 by French crystallographer and mineralogist Jacques Louis, Comte de Bournon (1751–1825), after whom it was named. The name given by Bournon himself (in 1813) was endellione, since used in the form endellionite, after the locality in Cornwall where the mineral was first found.
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