52 Mr. Hatchett's Analysis of 
method, which has frequently been employed with success in 
similar cases. 
ANALYSIS. 
A. 
A mixture of 200 grains of the powdered ore with five times 
the weight of carbonate of potash, was exposed to a strong red 
heat, in a silver crucible. As soon as the matter began to flow, 
a very perceptible effervescence took place ; and, when this had 
subsided, the whole was poured into a proper vessel. 
The mass, when cold, was grayish-brown. 
Boiling distilled water was poured upon it ; and the brown 
residuum, which was considerable, was well edulcorated upon a 
filter. 
The filtrated liquor had a slight yellowish tinge, and, being 
supersaturated with nitric acid, afforded a copious white floccu- 
lent precipitate, which speedily subsided ; but, although a very 
considerable additional quantity of nitric acid was poured upon 
the precipitate, it was not re-dissolved. 
The residuum of the ore was dark brown, and was again 
melted with potash, and treated as before; but scarcely any 
effect was thus produced ; the alkali was therefore washed off, 
and the powder was digested with muriatic acid, which soon 
assumed the deep yellow colour usually communicated to it by 
iron. After half an hour, the acid was decanted, and the resi- 
duum was washed with distilled water. 
This powder was now of a much paler colour; and, being 
mixed with potash, it was melted and treated as before. A 
considerable precipitate was again obtained by the addition of 
nitric acid ; and the residuum, after being digested with mu- 
riatic acid, was again fused with potash, by which means the 
