OF COPPKU. 381 



1 atom arsenic acid 7 -75 



1 atom oxide of copper 5 

 4 atoms water 4-5 



17-25 



(2.) The second variety of Chenevix is usually s 

 called copper mica. It has a deep emerald green 

 colour, a specific gravity of 2*548, and is crys- 

 tallized in six-sided plates. Its primary form is 

 an acute rhomboid. It is a subsesquarseniate, 

 being composed of 



1 atom arsenic acid 7-75 



1 atom oxide of copper 775 

 3 atoms water 3-375 



18-875 



(3.) The third variety of Chenevix is usually 

 called olivenerz from its colour, which is a dark 

 or olive green. Its specific gravity is 4*280, 

 and its primary form a right rhombic prism ; it 

 consists of 



1 atom arsenic acid 7*75 



2 atoms oxide of copper 12'5 

 6 atoms water . . 6-75 



27-00 



(4.) The fourth variety of Chenevix is usually 

 in capillary crystals ; its primary form is an ob- 

 lique rhomb its colour and specific gravity the 

 same as the preceding. Its composition is also 



