BISMUTH GLANCE. 



BB on charcoal, easih' reduced to the me- 

 tallic state, and is volatilized if the heat be 

 continued. Soluble with effervescence in 

 acid. 



Localities. — English. Cornwall at Cost- 

 all-lost Mine, St. Roach, and at the Roy- 

 al Iron Mine near Lostwithiel. — Foreign. 

 Pulverulent at Schneeberg and Johanngeor- 

 genstadt in Saxony; Joachimstahl in Bo- 

 hemia; with plumbo-cupriferous sulphide 

 of bismuth and native gold at Beresof in 

 Siberia. 



Bismuth-ochre has been often mistaken 

 for Green Iron-ore, from which it may be dis- 

 tinguished by its external aspect, and by 

 the minerals which accompany it. 



It occurs with Native Bismuth, and is 

 also accompanied by Quartz and Brown 

 Spar. 



Bismuth Glance. See Bismuthine. 



Bismuth Silver, Dana ; Bismuthic 

 Silver, Phillips; Bismuthic Silver-ore, 

 Kirwan. Probably either cubical or hexa - 

 gonal. Generally in amorphous masses ; 

 rarely in acicular or capillary crystals. Co- 

 lour tin-white or greyish, subject to tarnish. 

 Lustre metallic. Opaque. Practure uneven. 

 Sectile. Soft. 



Analysis by Klaproth ; 

 B#muth .... 27-0 



Lead 33-0 



Silver 15-0 



Iron 4-3 



Copper 0-9 



Sulphur ..... 16-3 ^ 



96-5 



BB melts readily to a silvery bead, cover- 

 ing the charcoal with the oxides of lead 

 and bismuth, and giving off" fumes of sul- 

 phur. 



Soluble in nitric acid. 



Localities. With Copper Pyrites, in small 

 amorphous masses, at Schapbach, in the 

 Yallej' of Kinzig in Baden ; in the cupre- 

 ous shale of Mansfeld in Thuringia, and at 

 the mine of S. Antonio, near Copiapo, Chili. 

 It was formerly worked as an ore of silver. 



Bismuth Oxide, Haiiy. See Bismuth 

 Ochre. 



Bismuth Sulfure, Haiiy. See Bis- 

 muthine, 



Bismuth Sulfure Plombo-argenti- 

 fbre, Levy. See Bismuth Silver. 



Bismuth Sulfure Plojibo-cuprifere, 

 Haiiy. See Aikenite. 



Bismuthine, Brooke §- 3Iiller, Beudant, 

 Greg Sf Lettsom. Rhombic, Primary 



BTSMUTITE. 43 



form a right rhombic prism. Occurs in aci- 

 cular prisrns, and in minute crystals deeply 

 striated longitudinally ; also massive or 

 coarsely disseminated with a foliated struc- 

 ture like that of Galena, or a fibrous one 

 like Antimony. Colour and streak tin- 

 white or lead-grey, sometimes yellowish- 

 white, with an iridescent tarnish. Lustre 

 metallic. Opaque. Soft and brittle. H. 2 

 to 2-5. S.G. 6-4 to G-5. 



Fig. 49. 



Fig. 50. 



Comp. Bi2 S3 = sulphur 18-4, bismuth 81-6. 



Analysis from Cornwall, by Rammelsberg ; 

 Sulphur . . . .18-42 

 Bismuth .... 78-00 



Iron 1-04 



Copper 2-42 



99-88 

 Melts in the flame of a candle. BB melts 

 easily with a blue flame and sulphurous 

 smell ; if the heat be continued it is for the 

 most part volatilized, emitting numerous 

 small drops in an incandescent state, cover- 

 ing the charcoal with yellow, and leaving a 

 residue which is reducible with difficulty to 

 the metallic state. 



Readily soluble in hot nitric acid; and 

 yields a white precipitate on dilution with 

 water. 



Localities. — English. In Cornwall (,fig. 

 49) at Dolcoath, near Camborne ; St, Just, 

 Botallack ; Fowey Consols mine ; Hue! Ar- 

 thur ; George and Charlotte mine near Cal- 

 lington ; near Tavistock ; also in Cumber- 

 land at Brandy Gill, Carrock Fells, &c, — Fo- 

 reign. Joachimsthal, and Schlackenwald 

 in Bohemia; Johanngeorgenstadt, Schwar- 

 zenberg, Altenberg and Schneeberg in Sax- 

 (niy ; foliated with Cerite at Bastnas near 

 Riddarhytta in Sweden; with Chrysoberyl 

 at Haddam, Connecticut, U,S, Tal-ca in 

 Chili, 



JJ, P. G. Principal Floor, Wall-case 9 

 (British). 



BiSMUTlTE, Breithaupt, Dana. Occurs 

 in pseudomorphous acicular crystals; also 

 incrusting and amorphous. Colour white, 

 and dull mountain -green, occasionally straw- 

 yellow and yellowish-grey. Lustre vitreous 

 when pure, sometimes dull. Streak greenish- 

 grev or colourless. Subtranslucent to opaque. 

 Brittle. H. 4 to 4'5 S.G. 6-86 to 7-67. 



