104 THE MINERALS OF CHILE. 



White Antimony accompanies the last-mentioned mineral in several of its localities. It has 

 been found massive ; is of a snow-white color, with sometimes a reddish hue. We have no 

 analysis of this mineral from any of the localities in Chile. It is an oxide of antimony, and, 

 when pure, should consist of — 



Antimony ------- 84.32 



Oxygen 15.68 



100.00 

 Its formula is Sb 0'. 



Ajitimony Glance. — This is also found in the localities furnishing native antimony, with all 

 the ordinary i^roi^erties of this well known mineral. Its composition is — 

 Antimony ------- 72.89 



Sulphur - - - - - • - - 27.12 



100.00 



Its formula is Sb S^. 



Native Arsenic. — This substance occurs abundantly in the provinces of Atacama and Co- 

 quimbo. It is of a tin-white color that soon tarnishes ; it is volatilized completely by the 

 action of heat, and possesses all the other peculiarities of this metal. It often contains a little 

 antimony and iron. It accompanies ores of silver, particularly ruby silver, antimonial and sul- 

 phuret of silver, native silver, arsenical cobalt, arseniuret and sulpho-arseniuret of iron. I am 

 not informed of the existence of any other arsenical minerals in Chile, but presume the oxide 

 and sulphuret must also be found. 



ZINC. 



Blende — Sulphuret of Zinc. — This ore of zinc is found near the Leona mine in Eancagua. 



Specimens examined by M. Domeyko contained a notable amount of iron ; one of his analyses 



is as follows — 



Zinc -------- 43.0 



Iron - . - 12.4 



Sulphur - - - - - - - 28.6 



Gaugue --_____ 14.7 



97.7 



Its formula is Zn S, with iron, sometimes replacing a portion of the zinc. 



MISCELLANEOUS MINERALS. 



Besides these minerals described, there were a few others of a non-metallic character collected 

 by the expedition, which will be simply enumerated. 



Lajiis Lazuli. — This beautiful mineral occurs in no inconsiderable quantities in the province 

 of Coqnimbo. Carbonate of lime runs through the mass, in small veins^ and iron pyrites is 

 intimately mixed with it in small crystals. It being impossible to separate the two last 

 mentioned minerals from the lapis lazuli, no analysis was made of it. A specimen of the 

 mineral from the Andes was analyzed by Mr. T. Field, Avith the following results: 



