MANUAL OF NATURAL HISTORY. 617 



white ; 2, as oxide with carbonate of iron or 

 "Bismuth-ochre;" 3, as Sulphuret or "Bis- 

 muth-glance/' in acicular crystals, H. 2 2'5, 

 sp. gr. 6 '5, grayish, fusible in the flame of a 

 candle ; 4, as Silicate or " Bismuth-blende/' 

 Compounds of bismuth with carbonate of 

 soda under ihereducing flame of the blowpipe 

 yield brittle grains of bismuth. Symb. Bi. 



6. FAMILY. Stimmiides. Minerals containing 



Antimony either native or in combination. 

 Occur ] , pure as " Native Antimony/' rhom- 

 bohedral, H. = 3 3'.~, sp. gr. = 67, silver- 

 white ; 2, as oxide or " White Antimony/' in 

 small lamellar masses, H. = 2-5 3, sp. gr. = 

 5-5, fuses in the flame of a candle ; 3, as 

 Sulphuret or " Antimony-glance, in rhombic 

 or six-sided prisms, H. = 2, sp. gr. = 4'5, lead- 

 gray, volatizes before the blowpipe ; 3, as 

 oxide and Sulphuret combined, or " Ked 

 Antimony " (Kermes mineral), in red acicular 

 crystals, H. = 1 1-5, sp. gr. 4'5, fuses on 

 charcoal ; also with silver, lead, and arsenic. 

 Compounds of antimony with carbonate of 

 soda before the reducing flame of the blow- 

 pipe yield metallic globules, which at the 

 same time volatize. Symb. Sb. 



7. FAMILY. Arsenicides. Minerals containing 



Arsenic, either native or in combination. 

 Occur 1, pure or "Native Arsenic/' rhombo- 

 hedral, H. = 3 '5, sp. gr. = 5 '7, tin-white, 2, 

 as oxide or "Arsenious acid/' in powder or 



