I 45 3 
III. Analysis of a new Species of Copper Ore, By Thomas 
Thomson, M, D. F.R. S. L. and E. 
Read November i8, 1813. 
1 HE mineral which constitutes the subject of this paper was 
discovered by Dr. Benjamin Heyne about the year 1800 in 
the peninsula of Indostan, near the eastern border of the 
Mysore. From Dr. Heyne's description, it is probable that 
it occurs in nests in primitive rocks, which seem to be green 
stone, or at least connected with primitive trap. These rocks 
appear to be subordinate to mica slate. 'But I purposely omit 
all particular details, because I understand Dr. Heyne has 
himself a work in the press, in which the mineralogy of this 
country will be particularly described. 
Cop))er mines had been wrought in these mountains some 
centuries ago ; but they had been abandoned probably on ac- 
count of the various revolutions to which this part of India has 
been subjected. The most common ore which occurs in these 
mountains is malachite, and it seems to occupy very extensive 
veins ; but the species which I propose to describe here, occurs 
also in considerable quantity. It had been already made the 
subject of various experiments, with a view to determine how' 
much copper it contained, but I am not avyare that any person 
had subjected it to a regular chemical analysis, or recognised 
it as a new species. 
All the specimens of this ore which I have seen are amor- 
phous ; so that, as far as is known at present, it never occurs 
