130 PHl'SIOGBAPHY.'- 



Lustre metallic. Colour brass-yellow, inclining to 

 bronze-yellow and steel-grey. 



According to ARFVEDSON, it -consists of 

 Nickel 64-35. 

 Sulphur 34-26. 



Before the blowpipe it melts into a brittle metallic glo- 

 bule ; it colours glass of borax violet-blue ; in nitric acid 

 it is dissolved without leaving a residue, and forms a pale 

 green solution. It occurs at Johanngeorgenstadt in Sax- 

 on}^ Joachimsthal in Bohemia, and in the Westerwald, 

 accompanied by several species of Iron -pyrites, Lime-ha- 

 loide, &c. It has been sometimes called Capillary Pyrites. 



NEEDLE-ORE. 



GLANCE. $ ;. 



Needle-Ore. JAM. Man. p. 326. Acicular Bismuth- 

 Glance. Syst. Vol. III. p. 381. Plumbo-cupriferous 

 Sulphuret of Bismuth. PHILL. p. 274. 



Prismatic. Cleavage unknown, imperfect. Frac- 

 ture uneven. 



Lustre metallic. Colour blackish lead-grey. 

 Hardness = 2-0 ... 2-5. Sp. Gr. = 6-125, JOHN. 



Before the blowpipe its sulphur is driven off, and it 

 melts and emits numerous sparkling metallic globules. A 

 button of lead containing copper remains, which communi- 

 cates a greenish-blue colour to glass of borax. It is soluble 

 in nitric acid, and consists, according to JOHN, of 



Bismuth 43-20. 



Lead 24-32. 



Copper 12-10. 



Nickel 1-58. 



Tellurium 1-32. 



Sulphur 11-58. 



Gold 0-79. 



It occurs near Catharinenburg in Siberia, imbedded in 



