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 the reducing flame of the blowpipe 

 yield brittle grains of bismuth. Symb. Bi. 



6. Family. — • Stimmiides. Minerals containing 



Antimony either native or in combination. 

 Occur 1 , pure as " Native Antimony/' rhom- 

 bohedral, H. = 3 — 3'^ sp. gr. = 6*7, 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 Sidphuret combined, or " Bed 

 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 



