MINERAL from GREENLAND. -~ 399 
found them quite different. . Convinced by thefe experiments, 
that the mineral contained no yttria, but that one of its confti- 
tuents was a fubftance with which I was ftill unacquainted, I 
had recourfe to the following mode of analyfis, in order to ob- 
tain this fubftance in a pure ftate. 
Ill. ANaAtysis or ALLANITE. 
I. 100 grains of the mineral, previoufly reduced to a fine 
powder, were digefted in hot nitric acid till nothing more 
could be diffolyed.. The undiffolved refidue, which was filica, 
mixed with fome {cales of mica, weighed, after being heated to 
redne(fs, 35.4 grains. 
2. Tue nitric acid folution was tranfparent, and of a light- 
brown colour. When ftrongly concentrated by evaporation, 
to get rid of the excefs of acid, and fet afide in an open capfule, 
it concreted into a whitith folid matter, confifting chiefly of 
foft cryftals, nearly colourlefs, having only a flight tinge of 
yellow. Thefe cry ftals being left expofed to the air, became 
gradually moift, but did not {peedily deliquefce. The whole 
was therefore diffolved in water, and the excefs of acid, which _ 
was ftill prefent, carefully neutralifed with ammonia. By this 
treatment, the folution acquired a much deeper brown colour ; 
but ftill continued tranfparent. Succinate of ammonia was 
then dropped in with caution. A copious reddith-brown pre- 
cipitate fell, which being wathed, dried, and heated to rednefs 
im a covered crucible, weighed 25.4 grains. It poffeffed all 
the characters of black oxide of iron. For it was attracted by 
the magnet, completely foluble in muriatic acid, and the folw.- 
tion was not precipitated by oxalate of ammonia. 
3. Tue liquid being ftill of a brown colour, I conceived it 
not to be completely free from iron. On this account, an ad- 
Vou. VI. P. II. 3 B ditional 
