MINERALS OF CHILE. 83 



Besides these minerals described, there were a few others 

 of a non-metallic character collected by the expedition, which 

 will be simply enumerated. 



LAPIS LAZULI. 



This beautiful mineral occurs in no inconsiderable quantities 



in the province of Coquimbo. 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 with the following results: 



Silica 37.60 



Alumina 11.21 



Sulphur 1.65 



Iron 08 



Magnesia 36 



Soda 9.66 



Lime 24.10 



Carbonic acid 15.05 



99.71 

 Although this analysis differs somewhat from the mineral 

 procured from other localities, still the difference may be 

 accounted for by the unavoidable impurities. 



CALCAREOUS SPAR. 



This is found in all parts of Chile, and is one of the most 

 common gangue-rocks of the silver-ores. 



DOLOMITE. 



This is also a common mineral in Chile, forming in many 

 places beds of immense thickness. 



HEAVY SPAR 



Exists in the silver veins forming ore of the gangue-rocks. 



ASBESTOS (GREEN). 



A specimen was brought from the copper-mines of Coquimbo. 

 and another from Tambillos. 



TUNGSTATE OP LIME. 



This mineral is found in the copper-mines of Llamaco, near 

 to Chuapa, and contains about three per cent, of oxide of copper 

 in its constitution. 



