48 



of Copper from Cornwall, and it appears not to have been 

 well known when Mr. Rashleigh published his first part of 

 Specimens of British Minerals, 8tc, for it was there called 

 "Thin four-sided Crystals of bright Green Copper Ore from 

 Carharrack." Mr. Kirvvan informs us of its being first 

 taken for Green Mica by Werner, and afterwards for 

 Calcolite. 



The matrix of this specimen is Quartz, Arseniate of 

 Copper, 8cc. Under the blowpipe it melts, "becoming black. 



TAB. CXXVI. 



This variety is of a yellower hue, and appears to be splitting 

 and decomposing, as it seems to decay at the edges, be- 

 coming rounded as if worn by oxygenizement. The gangue 

 is chiefly a black Oxide of Copper. 

 Its Spec. Grav. is 3-1212. 



