MINERAL from GREENLAND. — 391 
. TRANSLUCENT. 
Harpness equal to that of felfpar. Iron fcratches it with 
difficulty. : 
BRITTLE. 
Easixy frangible. 
SPECIFIC gravity, at the temperature of 60°, 2.378. The 
fpecimen was not abfolutely free from fahlite, 
WHEN heated to rednefs, does not decrepitate, nor fall to 
powder, but becomes dark-grey, and aflumes very nearly the 
appearance of the Swedifh natrolite of Mr Arian, which I 
confider as fettftein. If any particles of fahlite be mixed with 
it, they become very confpicuous, by acquiring a white colour, 
and the opacity and appearance of chalk. The lofs of weight 
was 2.1 per cent. I was not able to melt it before the blow- 
pipe. 
II. CHEMICAL ANALYSIS. 
1. A HUNDRED grains of the mineral, reduced to a fine pow- 
der, were mixed with 200 grains of pure foda, and expofed for 
-an hour to a ftrong red heat, in a platinum crucible. The mix- 
ture melted, and.aflumed, when cold, a beautiful grafs-ereen 
colour. When foftened with water, the portion adhering to © 
the fides of the crucible acquired a fine brownifh-yellow. Ni- 
tric acid being poured: upon it, a complete folution was ob- 
tained. 
_ 2. Suspectinc, from the appearance which the fufed maf 
affumed, that it might contain chromium, I neutralifed the {o- 
lution, as nearly as poflible, with ammonia, and then poured 
into it a recently prepared nitrate of mercury. A white preci- 
pitate fell, which being dried, and expofed to a heat rather un- 
der rednefs, was all diffipated, except a fmall portion of grey 
matter, 
