MINERAL: from GREENLAND. 385 
acids: Ammonia throws it down in gelatinous flocks: Zinc 
does not precipitate it at all. 
h. Tue white oxide of cerium, mentioned by HistnceEr and 
Berzetius, and defcribed by VaugueEtin, did not prefent itfelf 
to me in any of my experiments ; unlefs the white flocks preci- 
pitated by ammonia from the original folution be confidered as 
white oxide. They became brown on drying, and when heat- 
ed to rednefs, were certainly converted into red oxide. 
As cerium, as well as iron, is precipitated by fuccinate of 
ammonia, the preceding method of feparating the two from 
each other was not unexceptionable. Accordingly, in fome 
fubfequent analyfes, I feparated the cerium by means of oxalate 
of ammonia, before I precipitated the iron. I found that the 
proportions obtained by the analyfis above defcribed, were fo 
near accuracy that no material alteration is neceflary. 
8. THE liquid, thus freed from iron, alumina, and cerium, 
was mixed with carbonate of foda. It precipitated a quantity 
of carbonate of lime, which amounted, as before, to about 17 
grains, indicating 9.2 grains of lime. 
From the preceding analyfis, which was repeated no lefs 
than three times, a different method being employed in each, 
the conftituents of allanite are as follows : ; 
Silica, - - ~ 35-4. 
Lime, .. = - - 9.2 
Alumina, - - 4.1 
Oxide of iron, - - 25-4 
Oxide of cerium, - - 33-9 
- Volatile matter, - - 4e 
112.0 
Nox. VI. P. II. 3C I 
