326 Bowen’s Analysis. 
tals which were deposited after the solution had been much: 
concentrated by evaporation ; did not possess the usual form 
of the barytic salt. An examination of the mineral was in 
consequence undertaken, the results of which follow. Its 
specific gravity is 4.36—colour pure white—structure broad 
foliated—-lustre shining—and in its other external.characters 
it agrees so completely with common specimens of sulphate 
of barytes, that a further description of it would be unneces- 
sary. 
Analysis. 
A 
1. Distilled water digested upon the mineral in powder 
for one hour was rendered slightly turbid by nitrate of silver, 
and by oxalate of ammonia. 
2. Pure muriatic acid was then poured upon the powder, 
and heated with it for half an hour; it dissolved nothing, 
however, excepting a scarcely perceptible portion of iron. 
3. Two hundred grains exposed for one hour to a high 
red heat, lost only two grains in weight. 
B. 
Two hundred grains of the mineral finely powdered and 
sifted, were mixed with three times their weight of pure 
crystallized carbonate of potash, and exposed for two hours 
to a moderate red heat in a crucible of pure silver. _ 
C. 
The mass (B) after having been pulverized and boiled 
with water, was thrown upon a filter, and the insoluble por- 
tion repeatedly washed with distilled water. 
D. | ‘i 
To the filtered solution muriatic acid was added in ex- 
cess, and the fluid evaporated to dryness. Water being 
then poured upon the mass, there remained undissolved one 
grain, which was silex. 
. Es 
To the insoluble powder (C) diluted muriatic acid was 
added, when it was entirely dissolved with effervescence, ex- 
cepting a residue of four grains of siliceous earth. 
