MINERAL from GREENLAND. 393 
6. Tue black refidue which the potafh-ley had not taken up, 
was diffolved in diluted fulphuric acid. The folution being 
evaporated to ‘drynefs, and the refidue digefted in hot water, a 
white foft powder remained, which, heated to rednefs, weighed 
3.6 grains, and was fulphate wf lime, equivalent to about: 2 
grains of lime. 
7. Tue liquid from which the fulphate of lime was fon 
rated, being exactly neutralifed by ammonia, fuccinate of am- 
monia was dropped in; a brownifh-red precipitate fell, which, 
being heated to rednefs in a covered crucible, weighed 1 grain, 
and was black oxide of iron. 
8. THE refidual liquor being now examined by different re- 
‘agents, nothing farther could be precipitated from it. 
g.. Tue liquid (No. 4.) from which the alumina, lime, and 
iron had been‘ feparated by carbonate of potafh, being boiled 
for fome time, let fall a fmall quantity of yellow-coloured mat- 
ter. This matter being digefted im diluted fulphuric acid, part- 
ly diffolved with effervefcence ; but a portion remained undif- 
folved, weighing 1 grain. It was infoluble in acids, and with 
potafh melted into a colourlefs glafs. It was therefore filica. 
The fulphuric acid folution being evaporated to drynefs, left a 
refidue, which poffefled the properties of fulphate of lime, and. 
which weighed 1.2 grains, equivalent to about 0.7 grains of 
lime. 
10. THE conftituents obtained by the preceding analyfis be-- 
ing obvioufly defective, it remained to éxamine whether the 
mineral, according to the conjecture of Bournon, contained 
an alkali. For this purpofe, 100 grains of it, reduced to a fine: 
powder, and mixed with 500 grains of nitrate of barytes, were 
expofed for an hour to a red heat, in a porcelain crucible. The 
fufed mafs was foftened with water, and treated with muriatic 
acid. The whole diffolved, except 25 grains of a white pow- 
Vou. VI..PoIk + < 3D ont &.- dere 
