MINERAL from GREENLAND. 375 
fulphate of potath, fhot into cryftals of alum. It was therefore 
alumina, and amounted to 4.14 grains. 
3. Tue yellow matter which refufed to diffolve in the pot- 
afh-ley, was mixed with nitric acid. An effervefcence took 
place, but the liquid remained muddy, till it was expofed to 
heat, when a clear reddifh-brown folution was effected. This 
folution was evaporated to drynefs, and kept for a few minutes 
in the temperature of about 400°, to peroxidize the iron, and 
render it infoluble. A fufficient quantity of water-was then 
poured on it, and digefted on it for half-an-hour, on the fand- 
bath. The whole was then thrown upon a filtre. The dark 
red matter which remained on the filtre, was drenched in oil, 
and heated to rednefs, in a covered crucible. It was then 
black, and attracted by the magnet; but had not exadtly the 
appearance of oxide of iron. It weighed 42.4 grains. _ 
4. THE liquid which paffed through the filtre, had not the 
fweet tafte which I expected, but a flightly bitter one, fimilar. 
to a weak folution of nitrate of lime. Hence it was clear, that 
mo yttria was prefent, as there ought to haye been, had 
the mineral contained that earth. This liquid being mixed 
with carbonate of ammonia, a white powder precipitated, 
which, after being dried in a red heat, weighed 17 grains. It 
diflolved in acids with effervefcence ;. the folution was precipi- 
tated white by oxalate of ammonia, but not by pure ammonia. 
When diffolved in fulphuric acid, and evaporated to drynefs, a 
light white matter remained, taftelefs, and hardly foluble in. 
water. Thefe properties indicate carbonate of lime. Now, 17 
grains of carbonate of lime are equivalent to about 9.23 grains. 
of lime. 
5. From 
4 
