a new Species of Copper Ore, 49 
From the preceding analysis, it appears that the ore is com- 
posed as follows : 
Carbonic acid 
16.70 
Peroxide of copper 
60.75 
Peroxide of iron 
1950 
Silica 
2.10 
Loss 
' 0-95 
100.00 
The silica was obviously accidental, and derived from the 
quartz crystals ; so that the ore, in fact, consists of carbonic 
acid, peroxide of copper, and red oxide of iron. In the differ- 
ent analyses, I have found the copper to vary a little. The 
least quantity I obtained was 48.6, the greatest 51 grains. 
The red oxide of iron and siliceous matter varied also some- 
what.' The least quantity obtained was 19 grains, the greatest 
25 grains. These variations are owing chiefly to the admix- 
ture of quartz crystals, and partly to the specks of malachite 
and red oxide of iron with which the ore is interspersed. 
The carbonic acid is obviously combined with the black 
oxide of copper, so as to constitute carbonate of copper. Now 
carbonate of copper, as I ascertained by a direct analysis, is 
composed of an integrant particle of carbonic acid, and an 
integrant particle of black oxide of copper. An integrant 
particle of carbonic acid, as I have shewn elsewhere, weighs 
2.751, and an integrant particle of peroxide of copper weighs 
10. Now 2.751 is to 10 as 16.7 is to 60.75, so that there can 
be no doubt that the carbonic acid and oxide of copper are 
united in the ore. As to the oxide of iron, I am disposed to 
consider it as only mechanically mixed; because in one expe- 
MDCCCXIV. H 
