MINERALS OF CHILE. 81 



COBALT BLOOM — ARSENIATE OF COBALT. 



It is found in all the veins containing the arseniurets of 



cobalt, and also in most of the silver veins, but never in any 



considerable quantity. At Arqueros it is found with the native 



amalgam, and with native and horn silver, in the mines of 



Argua, Amarga, Chanarcillo, Punta Brava, Tunas, etc. It is 



crystallized in radiating crystals of a peach-blossom color, and 



consists of 



Arsenic acid 38.21 



Oxide of cobalt 35.92 



Oxide of nickel .08 



Oxide of iron 2.13 



Lime 32 



Water 23.16 



The formula is Co 3 ls+8 fi. 99 ' 82 



NICKEL GLANCE — ARSENICAL NICKEL. 



This is found in Atacama. It is of a steel-gray color; freshly 

 broken surfaces soon tarnish. No analysis was made of this 

 mineral from the above locality; and we know of none that 

 has been made. When pure its constitution should be 



Arsenic 45.16 



Sulphur 19.33 



Nickel 35.51 



100.00 

 Its formula is Ni S 2 -f-Ni As. Other metals, especially iron, 

 frequently replace the nickel to some extent. 



NATIVE BISMUTH. 



This is found, alloyed with silver, in the San Antonio mine, 

 Atacama. The mineral has already been described, under the 

 head of the silver minerals. It commonly contains from four- 

 teen to fifteen per cent, of bismuth. 



NATIVE ANTIMONY. 



This is found in considerable quantity in the silver-veins in 

 the mines of Carriso. It is disseminated in small irregular 

 veins, and in laminae, like galena. The most constant compan- 

 ions of it are native silver, ruby-silver, gray antimony, gray 

 copper, etc. The gangue is carbonate of lime and heavy spar. 



