7A A New Ore of Uranium. 
will admit of a satisfactory quantitative analysis. The following 
are the characters on which thi ies 1 ed. 
Massive and compact ; cleavage, none. 
H=4-°5, G=4'378. Lustre resinous; fracture conchoidal, un- 
even: streak gray. 
Before the blowpipe unalterable; after exposure to an intense 
heat, the mass assumes a grayish color; but on examination with 
a lens, it is found that this appearance is owing to a great number 
of threads of foreign substances by which the mass is penetrated. 
With borax it melts slowly into a glass yellow while hot, and 
pale yellow when cold: in the reducing flame, the bead affords 
indications of iron. 
_ This mineral as I am informed by Mr Stanard, occurs on the 
north shore of Lake Superior, about seventy miles from the Sault 
St. Marie, at the junction of trap and sienite; the vein in which 
it is found is about two inches in width; but on account of its po- 
sition, (on the face of an almost perpendicular cliff,) only a few 
specimens were obtained, and those with great difficulty. Fr 
the purpose of ascertaining its composition, the following exper- 
iments were made. 
A small portion was pulverized: the powder was of a pale 
gray color. 
A. This powder was treated with hydrochloric acid, it dissolv- 
ed rapidly, with violent effervescence, and slight evolution of hy- 
dro-sulphuric acid. The solution was of a bright yellowish green 
color: it was evaporated to dryness, and left a dark green mass. 
Water was added and the solution filtered, a small quantity of 
silica was left on the filter. The solution was then boiled, when 
the color changed to a dark blackish-green, almost opake ; on 
ebullition being continued, a copious black-green precipitate was 
formed, and a colorless solution remained. This precipitate was 
collected on a filter and washed (a). 
B. The remaining solution was very astringent ; ammonia was 
added to it with the formation of a copious precipitate, slightly 
tinged with green, becoming yellow on exposure (6). The res- 
idual liquid was tested with sulphuric acid, and then with oxal- 
ate of ammonia, the latter caused a precipitate of oxalate of lime. 
The remaining solution, on being evaporated, left a residuum, 
volatilizable by heat, consisting only of the ammoniacal salts. 
-a. ‘This precipitate dissolved with ease in dilute sulphuric acid ; 
forming a pale green solution becoming yellow when heated with 
nitric acid, and on evaporation depositing small yellow crystals, 
and giving a copious red-brown precipitate with ferrocyanid of 
potassium. It was therefore protoxyd of uranium. 
_ 6. This precipitate was heated with a solution of potassa, @ 
great portion was dissolved leaving a dark brown residuum (c)- 
The portion dissolved appeared to umunia, 
