374 On ALLANITE, a new 
Eastty frangible. 
Powper, dark greenifh-grey. 
Berore the blow-pipe it froths, and melts imperfectly into 
a brown {coria. , 
GELATINISEs in nitric acid. In a ftrong red heat it lofes 
3-98 per cent. of its weight. 
Il. ExprRIMENTs TO ASCERTAIN ITS COMPOSITION. 
My firft experiments were made, on the fuppofition that the 
mineral was a variety of gadolinite, and were pretty much in 
the ftyle of thofe previoufly made on that fubftance by Exx- 
BERG, KLAPROTH, and VAUQUELIN, | 
I. 100 grains of the mineral, previoufly reduced to a fine 
powder in an agate mortar, were digefted repeatedly on a fand 
' bath in muriatic acid, till the liquid ceafed to have any action 
onit. The undiffolved refidue was filica, mixed with fome frag- 
ments of mica. When heated to rednefs, it weighed 33.4 
grains. 
2. THE muriatic acid folution was evaporatet almoft to dry- 
nefs, to get rid of the excefs of acid, diflolved in a large quan- 
tity of water, mixed with a confiderable excefs of carbonate of 
ammonia, and boiled for a few minutes. By this treatment, 
the whole contents of the mineral were precipitated in the 
{tate of a yellowifh powder, which was feparated by the filtre, 
and boiled, while ftill moift, in potafh-ley. A fmall portion of | 
it only was diffolved. “The potath-ley was feparated from the 
undiflolved portion by the filtre, and mixed with a folution of 
fal ammoniac, by means of which a white powder precipitated 
from it. This white matter being heated to rednefs, weighed 
4.9 grains. It was digefted in fulphuric acid, but 3.76 grains 
refufed to diffolve. This portion poffeffed the properties of fi- 
lica. The diffolved portion being mixed with a few drops of 
fulphate 
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