52 BOURNONIT-NICKELGLANZ. 



Lead 42-88 



Copper 1306 



100-00 

 BB decrepitates and melts, giving off sul- 

 phur and fumes of antimon}^ after which a 

 crust of sulphide of lead remains, inclosing 

 a globule of copper. Readih' dissolves in 

 nitric acid, forming a blue solution. 



Localities. — English. In Cornwall at Huel 

 Boys, in the parish of St.Endellion (where it 

 was first noticed), y?^s. 60 and 61 ; also at St. 

 Merryn, near Padstow ; Nansloe. near Hel- 

 stone; Budock Vean, near Falmouth; and 

 in very fine, sometimes compound crj'stals 

 {wheel-ore) at Herodsfoot mine, near Lis- 

 keard, fig. 62. — Irish. Cahirglissawn lead 

 mine, between Gort and Kenmare, Kerry. — 

 Foreign. Very large crystals of Bournonite 

 are found in the mines of Xeudorf, in the 

 Harz, where they occasionally exceed an 

 inch in diameter. Good crystals occur at 

 Kapnik in Transylvania, and at Servoz 

 in Piedmont. Other localities are Brauns- 

 dorf and Gersdorf in Saxony. Clausthal 

 and Andreasberg in the Harz.^ France, at 

 Cransac, Dept. of I'Avevron. Mexico. 



Named in honour of Count de Bournon, 

 who first described this mineral, and Avho 

 gave it the name of Endellione, after the 

 parish of Endellion, in Cornwall, where it 

 was first found. 

 Brit. Mus., Case 11. 



M. P. G. Principal Floor, Case 15, Wall- 

 cases 7 and 14 (British); 21 (Foreign). 



BouKNONiT-NicKELGLANZ. An 016 from 

 Wolfsberg, in the Harz, which is consi- 

 dered by Rammelsberg to be a compound of 

 Ullmannite and Bournonite. It occurs in 

 cubes. H. 4-5. S.G. 5-63 to 5-7. 

 Analysis : 



Arsenic .... 28-00 

 Antimony .... 19-53 

 Nickel ..... 27-04 



Cobalt 1-60 



Lead 5-13 



Copper 1-33 



Iron 0-51 



100-00 



BoVEY Coal. A kind of Lignite occur- 

 ring in deposits of pipe-clay in the neigh- 

 bourhood of Bovey-Tracey, in Devonshire. 

 It burns with a weak, often bluish flame, 

 and gives off an offensive smell. S.G. 1-4 

 to 1-558. 



BovvENiTE. A bright apple-green variety 

 of Serpentine, resembling Nephrite. Struc- 

 ture granular. Very tough. H. 5. S.G. 2-57. 



BEAUNITE. 



Co7np. 2 MgS Si2 -1- Mg H. 



Analysis by Smith §• Brush : 



Silica 42-29 



Magnesia .... 42-29 

 Protoxide of iron „ . . 1-21 

 Lime • . . . . 1-90 

 Water 12-96 



99-65 



Locality. Smithfield, Rhode Island, U. S. 



Name. After Bowen, by whom it was first 

 described (as a variety of Nephrite). 



BowR. See Boort. 



Brachytypous Lead Baryte, Mohs. 

 See Cromfordite. 



Brachytypous Zinc Baryte, Mohs. See 



WiLOAMSITE. 



Branchite, Savi. A colourless, translu- 

 cent mineral, resembling Scheererite, from 

 the Brown Coal of Mount Vaso, in Tuscany. 

 It fuses at 75° C. (167° F.), but does not 

 crystallize on cooling. S.G. 1. 



Soluble in alcohol. 



Brandisite. a variety of Clintonite, oc- 

 curring in crystals, lining cavities in a rock 

 chiefly composed of Pyroxene, at Toal de la 

 Faja de Monzani, in the valley of Fassa, 

 Tyrol. 



It was named by Von Kobell after Count 

 de Brandi. See Disterite. 



Brit. Mus., Case 25. 



Brass Ore, Kirwan. A mixture of 

 Copper Pyrites and Blende. 



Braunbi.eierz, Werner; or Brown Lead 

 Ore. See Pyromorphite. 



Braun Eisenstein, Werner. See Limo- 

 nite. 



Braunitk. Pyramidal. General form a 

 pyramid very like the regular octahedron. 

 Occurs both crystalline and massive, or 

 fibrous and divergent, of a dark brownish - 

 black colour, with a submetallic lustre. 

 Streak black, or slightly brownish. Brittle. 

 Fracture even. H. 6 to 6-5. S.G. 4*75 to 

 4-81. 



Comp. iin = (Mn Mn) = manganese 



69-68, oxygen 30-32. 



^na/^/sis from Vizianagram, bv^. J. Scott, 



(S.G. 4-5) : 



Binoxide of manganese . 73-79 

 Oxygen . . . .1*86 

 Magnesia .... 2-34 



Water 0-54 



Silica 8-30 



Peroxide of iron . . . 12-91 



99-74 

 BB alone on charcoal infusible, but with 



