TLS. Hunt on anew Titaniferous Mineral. 31 
half an hour when the color of the mineral had become yellow- - 
ish-gray. “ting this operation the ere oo was not — 
corroded. | ; 
B. A large quantity of water was now mide’ to the acid mass, 
when a brownish powder separated, which by renewing the treat- 
ment with sulphuric acid became quite white, and was. nearly 
soluble in a solution of carbonate of soda, showing that it was 
principally silicic acid; this was confirmed by fusing a ‘portion 
of it with carbonate of soda, -and dissolving the fused mass in 
dilute ee —_— asa aight on esepunms silicic — 
86 ' 
_ C. The ésliainth deine Ba was boiled, ‘when titanic acid was 
bundantly precipitated. After long’ ebullition the liquid was fil- _ 
seat (excluding as much as possible the air,) and by farther con- 
centration reduced to a small bulk; it had a delicate green tint 
and was found to contain protoxide i iron, with a mere trace of 
peroxide, which probably arose from a slight absorption of oxygen, 
and the iron in the mineral was consequently supposed to exist as 
a protoxide. 
D. After peroxidation by nitric acid, the solution was precipi- 
tated by ammonia: the filtrate was not affected by sulphuret of 
ammonium, it gave with oxalate of ammonia, a slight precipi- 
tate of lime, but with phosphate of soda and ammonia an abund- 
ant one, of phosphate of magnesia and ammonia. 
-_E. The precipitate by ammonia was redissolved by a little di- 
lute sulphuric acid, several crystals of sulphate of potassa were 
added, and the whole allowed to stand for twelve hours; at 
the end of this time a large quantity of crystals had formed, 
which were however completely dissolved by a saturated solu- 
tion of sulphate of potassa. This showed the absence of cerium 
and lanthanum, as also of thorium and zirconia. An excess of pure 
potassa ‘was then added to the haem the were digested 
for’ some hours and then filtered. : 
» EF. The filtrate was neutralized with. hydrochloric acid, when 
carbonate of ammonia gave an abundant precipitate of alumina. 
The precipitate by potassa was dissolved in hydrochloric acid, 
and after being largely diluted and rendered quite neutral, succi- 
nate of ammonia was added ; the whole was then heated nea 
to the boiling point, and as soon as it had’ cooled, the sol 
Was filtered. These precautions were taken to prevent the 3 
