MINERALOGY. t 9 $ 



fometimes found decompofed or weathered* 

 and changed into a deep mountain blue* 

 Seel, exciv. 



SECT. CXCVIII. 



2. With fulphu rated iron, Miner a cupri pyri- 

 tacea : Yellow copper ore. Marcafkical 

 copper ore, Pyrites cupri. 



This is various both in regard to colour* 

 and in regard to the different proportion of 

 each of the contained metals ; for inftance: 



a. Blackifh grey, inclining a little to yel- 

 low, Pyrites cupri grifeus. 



When decayed or weathered, it is of 

 a black colour ; is the richeft of all the 

 varieties of this kind of copper ore, 

 yielding between 50 and 60 per cent, and 

 is found in Spain and Germany. 



b. Reddifh yellow, or liver brown, with a 

 blue coat on the furface, Ivlinera cupri 

 lazurea. 



This ore yields between 40 and 50 per 

 cent, of copper, and is commonly faid 

 to be blue, though it is as red when frefh 

 broke, as a rich copper reguius. 



c. Yellowifh green, Pyrites cupri JIavc I'viri- 

 dzfeens. 



This is the mod common in the north 

 part of Europe 5 and is, in regard to its 

 texture, found 



1. Solid, and of a mining texture, from 

 Oilanberg, in the province of Daiarne, 



2. Steel-grained, of a dim texture, from 

 the fame place, and Falun in Daiarne. 



3. Coarfe-grained, is of an uneven and 

 mining texture. It occurs in moll of 



O thf 



