47 
a new Species of Copper Ore, 
1. 100 grains in the state of a coarse powder were put into 
a phial containing diluted sulphuric acid, and the mouth of 
the phial was stopped with cotton wool. The loss of weight, 
when the effervescence was at an end, amounted to 167 
grains. This loss was owing to the escape of carbonic acid 
gas. 
3. 100 grains of the ore were treated in the same way 
with muriatic acid. The green solution was decanted off, and 
evaporated nearly to dryness, to get rid of the excess of acid. 
A plate of zinc was then put into the liquid previously 
diluted with water. The copper precipitated weighed 48.5 
grains. 
On repeating the analysis, I found that the muriatic acid 
had likewise taken up a portion of iron. I therefore super- 
saturated the solution with ammonia, and threw the whole 
upon a filter. By this means the red oxide of iron was sepa- 
rated. The ammoniacal solution was then neutralized by 
muriatic acid, and the copper thrown down by a plate of zinc. 
But during my first analysis, none of the iron was taken up 
by the cold muriatic acid, owing, no doubt, to the state of its 
aggregation. 
3. The red powder, which remained undissolved after the 
muriatic solution was drawn off, was boiled for several hours 
in nitromuriatic acid. The matter gradually diminished in 
bulk and became white, while the acid acquired a golden yel- 
low colour. The acid was now separated from the undissolved 
powder, evaporated nearly to dryness to get rid of the excess 
of acid, diluted with water, and mixed with an excess of am- 
monia. A brown powder fell, which was separated by the 
filter, and which, after being exposed to a red heat, weighed 
