KELLER— NOTES ON CHILEAN COPPER MINERALS. 



85 



Fig. I. Atacamite from Paposo, Chile. 



from certain localities in South Australia.* As was to be expected, 

 the analysis showed the specimens to be an atacamite of unusual 

 purity and of normal composition. It yielded : 



Sp.gr 3738 



Calculated for 

 Found. CuCli,.3Cu(OH)j. 

 Per Cent. Per Cent. 



Chlorine 16.51 16.6 



Copper 1479 149 



Cupric oxide 55-28 55-8 



Water 12.42 12.7 



Insol 79 



99.79 lOO.O 

 Central High School, Phil.adelphia. 



* I hope to verify this by actual measurement. 



