a mineral Substance from North America. 53 
whole was completely decomposed, after about five repetitions 
of each operation. 
B. 
The muriatic solution was diluted, and, being saturated with 
ammonia, afforded a plentiful ochraceous precipitate • which 
again was dissolved in cold dilute nitric acid, and afforded a 
small quantity of a white insoluble substance, similar to that 
which was obtained from the alkaline solution. From this 
nitric solution, I then obtained, by means of ammonia, a pre- 
cipitate of oxide of iron, which, being properly dried, weighed 
40 grains. 
C. 
The different alkaline solutions which had been made subse- 
quent to that which has been first mentioned, were mixed 
together, and, being supersaturated with nitric acid, afforded 
the same white insoluble precipitate; the total quantity of which, 
obtained from 200 grains of the ore, amounted to about 155 
grains. 
The liquor from which this precipitate had been separated 
by nitric acid, was then saturated with ammonia, and, being 
boiled, afforded about 2 grains of oxide of iron. 
I obtained, therefore, from 200 grains of the ore. 
Oxide of iron - - - Grains. 
And of the white precipitated substance 155] “ W- 
But, as I could not repeat the analysis without destroying the 
remaining part of the only specimen at present known of this 
ore, I do not wish the above stated proportions to be regarded 
as ngidly exact , it will be sufficient, therefore, to say at present, 
that the ore is composed of about three parts of the white matter, 
and rather less than one of iron. 
