70 



it. An estimate of the chlorine returned 16*09 per cent., pro- 

 bably slightly low on account of difficulty in obtaining the 

 mineral quite free from impurity. 



The latter two were noted to carry more iron than the 

 bdutiful laminated variety first described. Nickel and 

 cobalt were found absent in all three, though, on account of 

 abundance of their ores m the vicinity, it was suspected that 

 perhaps replacement by them of part of the basic constituent 

 in the atacamite might be answerable for the variety of habit. 



