Bournonite

Bournonite 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 by the comte de Bournon in 1804, 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.

The crystals are orthorhombic, and are generally tabular in habit owing to the predominance of the basal pinacoid; numerous smooth bright faces are often developed on the edges and corners of the crystals. Usually, however, the crystals are twinned, the twin-plane being a face of the prism (m); the angle between the faces of this prism being nearly a right angIe (86 20), the twinning gives rise to cruciform groups and when it is often repeated the group has the appearance of a cog-wheel, hence the name "Rdelerz" (wheel-ore) of the Kapnik miners. The repeated twinning gives rise to twin-lamellae, which may be detected on the fractured surfaces, even of the massive material.

The mineral is opaque, and has a brilliant metallic lustre with a lead-grey color. The Mohs hardness is 2.5, and the specific gravity is 5.8.

At the original locality, Wheal Boys in the parish of St Endellion in Cornwall, it was found associated with jamesonite, blende and chalybite. Later, still better crystals were found in another Cornish mine, namely, Herodsfoot mine near Liskeard, which was worked for argentiferous galena. Fine crystals of large size have been found with quartz and chalybite in the mines at Neudorf in the Harz, and with blende and tetrahedrite at Cavnic near Baia Mare in Romania. A few other localities are known for this mineral.

References

*1911


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Look at other dictionaries:

  • Bournonite — Catégorie II : sulfures et sulfosels[1] Bournonite Les Malines, Gard, France (XX 6x5cm) …   Wikipédia en Français

  • Bournonite — Bour non*ite, n. [Named after Count Bournon, a mineralogist.] (Min.) A mineral of a steel gray to black color and metallic luster, occurring crystallized, often in twin crystals shaped like cogwheels (wheel ore), also massive. It is a sulphide of …   The Collaborative International Dictionary of English

  • bournonite — [buʀnɔnit] n. f. ÉTYM. 1903, in Rev. gén. des sc., no 3, p. 164; de Bournon, minéralogiste français, 1751 1825. ❖ ♦ Minér. Sulfure naturel de plomb, d antimoine et de cuivre …   Encyclopédie Universelle

  • bournonite — burnonitas statusas T sritis chemija apibrėžtis Mineralas. formulė CuPbSbS₃ atitikmenys: angl. bournonite rus. бурнонит …   Chemijos terminų aiškinamasis žodynas

  • bournonite — /bawr neuh nuyt , bohr , boor /, n. Mineral. a sulfide of lead, antimony, and copper, PbCuSbS3, occurring in gray to black crystals or granular masses. Also called cogwheel ore. [1795 1805; named after Count J. L. de Bournon (d. 1825), French… …   Universalium

  • bournonite — noun A sulfosalt mineral, a sulfantimonite of lead and copper …   Wiktionary

  • bournonite — bour·non·ite …   English syllables

  • bournonite — /ˈbɔnənaɪt/ (say bawnuhnuyt) noun a mineral sulphide of lead, copper, and antimony; occurring in wheel shaped twins; wheel ore. {from the name of its discoverer, Count Bournon (d. 1825) + ite1} …   Australian English dictionary

  • bournonite — ˈbōrnəˌnīt, ˈbȯr , ˈbu̇r noun ( s) Etymology: Count J.L.deBournon died 1825 French mineralogist + English ite : a mineral PbCuSbS3 consisting of a steel gray or black metallic looking sulfide of antimony, lead, and copper occurring in… …   Useful english dictionary

  • Berthonite — Bournonite Bournonite Catégorie II : sulfures et sulfosels Bournonite Les Malines, Saint Laurent le Minier, Gard France (XX 6x5cm) …   Wikipédia en Français


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