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Encyclopedia Britannica

BOURNONITE

This article appears in Volume V04, Page 333 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: BOS-BRI

BOURNONITE , a

mineral

MINERAL

species, a sulphantimonite of lead and copper with the

formula

PbCuSbS3. It is of some

interest

INTEREST

on account of the twinning and the beautiful development of its crystals. 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

CORNWALL

where the

mineral

MINERAL

was first found. The crystals are orthorhombic, and are generally tabular in habit owing to the predominance of the basal pinacoid (c); numerous smooth

bright

BRIGHT, JOHN (1811-188g)
BRIGHT, SIR CHARLES TILSTON

faces are often 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-plane being a face of the prism (m) ; the

angle

ANGLE (from the Lat. angulus, a corner, a diminutive, of which the primitive form, angus, does not occur in Latin; cognate are the Lat. angere, to compress into a bend or to strangle, and the Gr. ayKOS, a bend; both connected with the Aryan root ank-, to

between the faces of this prism being nearly a right

angle

ANGLE (from the Lat. angulus, a corner, a diminutive, of which the primitive form, angus, does not occur in Latin; cognate are the Lat. angere, to compress into a bend or to strangle, and the Gr. ayKOS, a bend; both connected with the Aryan root ank-, to

(86 20'), the twinnihg gives rise to cruciform groups (fig. 2),
and when it is often repeated the group has the

appearance

APPEARANCE (from Lat. apparere, to appear)

of a cog-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-grey colour. The hardness is 22, and the specific gravity 5.8.
At the

original

ORIGINAL

locality, Wheal Boys in the parish of Endellion in

Cornwall

CORNWALL

, it was found associated with jamesonite,

blende

BLENDE, or SPHALERITE

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

BLENDE, or SPHALERITE

and tetrahedrite at Kapnik-Banya near Nagy-Banya in

Hungary

HUNGARY
HUNGARY (Hungarian Magyarorszdg)

. A few other localities are known for this mineral. (L. J. S.)

End of Article: BOURNONITE

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