14£ ANALYSIS 01 



2. Of a Ferruginous Oxydulated Copper Ore. 



This ore occurs in Lebanon County, Pennsylva 

 nia, accompanied by oxydulated Iron ore ; occasion- 

 ally by minute portions of pyrites, and is frequently 

 inciusted with green carbonate of copper. Its co- 

 lour, both in the massive and pulverulent state, is 

 redish brown. It possesses little or no lustre. 0- 

 paque. Amorphous. Fracture, irregular. Frag- 

 ments, indeterminate. Strongly magnetic. The 

 specific gravity of a piece containing some slight 

 traces of carbonate, was 4. 554. 



Analysis. 



A. 5 Grammes, of the pulverized ore, were expo- 

 sed to a red heat, and it was stirred in order to allow 

 the copper and iron to pass to the state of per- 

 oxydes. After the calcination, the powder was 

 black, and the loss of weight was 0. 10 grammes ; 

 but the quantity of oxygen absorbed by the deutoxide 

 of iron and the protoxide of copper, was found by 

 calculation to amount to 0. 249 grammes ; therefore, 

 the loss in water amounts to 0. 349 grammes, on o 

 grammes, or 6. 98 per 100. 



13. The calcined ore (A.) was boiled with nitro- 

 muriatic acid, to which it soon imparted a deep green 

 colour, when the argilaceous residue appeared flaky 

 and colourless ; the solution was evaporated to dry- 

 ness, to expel the excess of acid, the residue of a 

 green colour, was treated with water, and the solu- 

 tion was filtered : the argil remaining on the filter, 



