I 
36 MINERALOGICAL 
fome time in a boiling heat afterwards 
1 added cautioufly two ounces of concen¬ 
trated marine acid, digefted it again, and 
diluted it with water: when the folution 
was clear, I poured it off from the refi- 
duum depofited at the bottom. I re¬ 
peated this procefs twice with the refi- 
duum, each time with half the quantity 
of the acids. The undiffolved refiduum 
weighed 98 grains, and retained its ap¬ 
pearance. The folutions poured together 
had a fomewhatgold yellow colour: fome 
of it examined with phlogifticated alkali, 
difcovered iron by its blue colour. The 
reft of the folutions being faturated with 
vegetable alkali gave a precipitate of a 
dirty white colour, which weighed when 
% 
dry 27 grains. This precipitate examined 
with the blow-pipe, fhewed a tendency 
to melt and form a metallic globule, but 
this was again inftantly calcined. Melt¬ 
ed with microcofmic fait, a greyifh white 
porcelain-like fcoria was formed : with 
borax it would not unite, but remained 
diffufed 
