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BOURNONITE , a See also:mineral See also:species, a sulphantimonite of See also:lead and See also:copper with the See also:formula PbCuSbS3. It is of some See also:interest on See also:account of the twinning and the beautiful development of its crystals. It was first mentioned by See also:- PHILIP
- PHILIP (Gr.'FiXtrsro , fond of horses, from dn)^eiv, to love, and limos, horse; Lat. Philip pus, whence e.g. M. H. Ger. Philippes, Dutch Filips, and, with dropping of the final s, It. Filippo, Fr. Philippe, Ger. Philipp, Sp. Felipe)
- PHILIP, JOHN (1775-1851)
- PHILIP, KING (c. 1639-1676)
- PHILIP, LANOGRAVE OF HESSE (1504-1567)
Philip Rashleigh in 1797 as " an ore of See also:antimony," and was more completely described by the See also:comte de Bournon in 1804, after whom it was named: the name given by Bournon himself (in 1813) was endellione, since used in the See also:form endellionite, after the locality in See also:Cornwall where the mineral was first found. The crystals are orthorhombic, and are generally See also:tabular in See also:habit owing to the predominance of the basal pinacoid (c); numerous smooth See also:bright faces are often See also:developed on the edges and corners of the crystals. An untwinned crystal is represented in fig. 1. Usually, however, the
crystals are twinned, the twin-See also:plane being a See also:face of the See also:prism (m) ; the See also:angle between the faces of this prism being nearly a right angle (86° 20'), the twinnihg gives rise to cruciform See also:groups (fig. 2),
and when it is often repeated the See also:group has the See also:appearance of a See also:cog-See also:wheel, hence the name Radelerz (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-See also:grey See also:colour. The hardness is 22, and the specific gravity 5.8.
At the See also:original locality, Wheal Boys in the See also:parish of Endellion in Cornwall, it was found associated with jamesonite, See also:blende and See also:chalybite.
Later, still better crystals were found in another Cornish mine, namely, Herodsfoot mine near See also:Liskeard, which was worked for argentiferous See also:galena. See also:Fine crystals of large See also:size have been found with See also:quartz and chalybite in the mines at Neudorf in the Harz, and with blende and See also:tetrahedrite at Kapnik-Banya near Nagy-Banya in See also:Hungary. A few other localities are known for this mineral. (L. J.
End of Article: BOURNONITE
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