F. W. Clarke on a new process in Mineral Analysis. 175 
which was not completely resolved by this process, Over an or- 
dinary Bunsen’s gas burner. This substance required the heat 
of a blast lamp. 
Wolfram is entirely decomposed, affording a pale yellowish 
mass, partly soluble in water. Hydrochloric acid dissolves a 
part of the residue, but a white powder, probably the hydrate 
of tungstic acid, remains unattacked. Fusion No. 2 possesses 
no advantages with wolfram. I should not recommend the use 
of this process for the analysis of wolfram, as it is so readily 
aap by nitric acid. I made the experiment, however, 
Joric acid, But it is always best to treat with hydrochloric 
acid, in order to dissolve any basic sulphates of iron that may 
formed. Upon boiling the filtered solution, niobic acid is 
precipitated. ‘ : 
Fusion No. 2.—A larger proportion of the mass is soluble in 
water than with the first. fusion, as no basic salts of iron are 
present, 
Itmenite is completely decomposed, giving a mass closely 
resembling that obtained from rutile. Cold water dissolves a 
large part of this, but leaves some basic salts which dissolve 
readily in hydrochloric acid. * tide ; 
Fusion No. 2.—The resulting mass dissolves completely in 
cold water, and by boiling the solution, the titanic acid can be 
precipitated. a 
hromic tron ore is decomposed very easily. In one case in 
Which I timed the operation, the fusion was complete in less 
than three minutes from the time I began to heat, and that 
over an ordinary Bunsen’s burner. The cooled mass is 
ight green, partly soluble in water alone, and entirely solubl 
in hydrochlori acid. 
usion No, 2.—The mass possesses a deeper green color 
than that obtained by the first fusion, and a larger proportion 
of it dissolves in water. In every fusion that I have yet made 
of chromite, however, a small quanti of = salts was 
iri varockians . 
formed, requiring treatment with 
