THE MINERALS OF CHILE. 95 



Light Ruby SUver. 



Silver 65.38 



Arsenic ----,__ 19.46 

 Sulphur 15.16 



100.00 



The formula heing — 



3 Ag S + As S^ 



The latter is the most common variety in Chile ; one specimen, analyzed by M. Domeyko, 

 furnished — 



Silver 63.85 



Iron .96 



Cobalt ---.-___ .19 



Arsenic -____.. 13.85 



Antimony ------- .70 



Sulphur - 18.00 



Gangue ------- i.eo 



99.15 



Antimonial Silver. — It is found both massive and crystallized near Coquimbo; it does not 

 exist abundantly, is of a tin- white color with metallic lustre, having specific gravity of 9.5. 

 This mineral is frequently mixed with arsenical and native silver ; when pure it contains — 

 Silver -------- 77 



Antimony ------- 23 



100 



Having for its formula Ag* Sb. 

 Polyhasife. — Found in considerable quantity in the province of Atacama, massive, of an iron 

 black color, and a specific gravity of 6.2 ; it is composed of — 



Silver 66.25 



Copper -___--- 4.08 



Arsenic ------- 5.22 



Antimony ------- 2.56 



Iron 2.34 



Sulphur 18.68 



99.13 



Its formula is considered to be — 



9 (Ag Cu==) S + (Sb As) S^ 

 Bismuth Silver. — In the mines of San Antonio, in the province of Cox3iap5, an alloy of silver 

 and bismuth is found ; its color is tin-white, high metallic lustre. The only analysis we 

 have of this variety of bismuth silver is one by M. Domeyko ; the following are the results — 

 Silver ----.-- 60.1 



Bismuth 10.1 



Copper ------- 7.8 



Arsenic ------- 2.8 



Gangue - - - - - - - 19.2 



100.0 



