176 F. W. Clarke on a new process in Mineral Analysis. 
Emery is rapidly and easily resolved. The mass contains 
basic compounds that require hydrochloric acid for complete 
solution; although water dissolves a large proportion of it. 
Fusion No, 2.—The mass thus obtained is or soluble 
n water. 
peer —(An exceedingly hard specular ore Brorsl the Til- 
den mine, Lake Superior). It was completely resolved, giving 
a mass partially soluble in water, but dissolving entirely in 
hydrochloric acid. 
Fusion No. 2.—The mass dissolves completely in water. 
Limonite and magnetite behave exactly like hematite. 
Zircon is entirely decomposed. All its silica is converted 
into the gaseous fluorid of silicon, and driven off. The mass 
obtained resembled that given by rutile. It dissolved almost 
entirely in cold water, but the solution speedily became tur- 
bid and deposited a white precipitate, which was either Zirco- 
nia or some basic salt of that oxyd. By first digesting the 
mass with a little strong hydrochloric acid and afterward add- 
ing water, the whole went into solution 
usion No. 2, afforded a mass vat a beautiful waxy luster, 
which was completely soluble in wate 
Kyanite is entirely resolved, and, like zircon, freed from sil- 
ica. 'The white mass contained basic c compoun nds, and conse- 
quently required hydrochloric acid for tara ome solu tion. 
second fusion gave a mass entirely soluble in wate 
Orthite is completely decomposed, and depen of silica. 
The mass was white, and dissolved partly in water. The in- 
soluble residue contained Dasic salts and some sulphate of lime, 
and hydrochloric acid dissolved all but the latter. 
Fusion No. 2.—With the exception of a little sulphate of 
lime, the mass dissolved in water. 
Quarts sand.—I subjected some of this substance to fusion 
with the mixture of bisulphate of potash and fluorid of so- 
dium, in order to ascertain to what extent silica would be con- 
verted into fluorid of silicon. The fusion took place very eas- 
uy, giving a white mass which dissolved almost entirely in 
Only a very small trace of insoluble residue remained, 
probably not more than one tenth of one per cent of the quan- 
tity of sand taken. It is very probable that more careful treat- 
ment would get rid of even that small amount. After this it 
e to doubt that any and all silicates would 
be decomposed and freed from silica by this process. A con- 
venient method i is thus afforded for the estimation of bases in. 
in mind, however, that a second fusion with 
cases be necessary. 
= acid will in most 
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