94 



artificially. The primitive form is a parallellopiped with 

 oblique angles :«— see the bottom outline. Spec. Grav. 2*19. 

 Analysis by Mr. Kirvvan : 



Oxide of Copper ... 40 

 Sulphuric Acid .... 3 1 

 Water ....... §9 



100 



Although water is necessary to this substance, as well as 

 to the Sulphates of Iron and Zinc, and might be considered 

 in sufficient proportion to make them aqueous species ; yet 

 we rather think the specific appellation best given from the 

 Sulphuric Acid, as most essential to their nature. 



