356 Contributions to Chemistry from the 
acid. The zircon was fused with fluohydrate of fluorid of potas- 
sium directly. In this manner a perfect resolution of the min 
eral was easily obtained; the fluozirconate of potassium was then 
dissolved out from the insoluble fluosilicate by hot water, acidu- 
lated with fluohydric acid. The observations of Wohler and 
Marignac suggested to me a further extension of the same pro 
cess, the general result of the.investigation being that fluohy- 
drate of fluorid of potassium or sodium may be employed with 
great advantage in resolving minerals containing metallic oxyds 
of the types RO, and R,O,. The special results are as follows. 
ucinum.—Glucina, purified from iron and aluminum by the 
usual methods, is to be fused with twice its weight of fluohy- 
drate of fluorid of potassium, and the fused mass treated with 
boiling water, to which a small quantity of fluohydric acid has 
been added. On filtering a notable quantity of the insoluble 
fluorid of aluminum and potassium almost always remains upon 
the filter, even when the separation from glucinum has been 
carefully executed, by means of carbonate of ammonia. The 
filtrate, on cooling, deposits colorless transparent crusts of the 
double fluorid of glucinum and potassium which are easily puri- 
fied by recrystallization. This method affords the simplest—l 
am almost disposed to say the only—method of obtaining a chem- 
ically pure salt of glucinum. The double salt is apt to contain 
an excess of fluorid of potassium. To obtain it perfectly pure for 
analysis, Mr. J. C. Newbery fused the fluohydrate of potassium 
with an excess of glucina. The salt as thus obtained gave him 
Calculated. Found. 
Glucinum, - é é wi 5°74 5°70 
Potassium, - - i - 47°73 47°76 
Fluorine, + - * - 46°58 46°50 
100-00 99°96 
which corresponds precisely with the formula G,F,+8KF, #f 
glucinum be taken as 7, or with GF+KF, if glucinum be taken 
as 4°66. In this analysis the fluorine was estimated by the loss. 
Berzelius gives the formula G,F,+3KF. Glucina may be 0 
tained directly from beryl, as Mr. Newbery” has found, by fusing 
the finely pulverized mineral with fluohydrate of potassiult, 
dissolving out the soluble double fluorid of glucinum and pe 
slum, and purifying by recrystallization. As, however, Dery’ 
contains only 13 or 14 per cent of glucinum, this process 18 ne 
economical, It is better to separate the other oxyds as far be 
possible by the ordinary methods and then to purify the ae 
glucina by the process above pointed out. It is perhaps wort 
1 notice that while almost all proto- and sesquioxyds give 19S 
~™ Prof. Joy had already re: be completely resolved by 
fusion with fiuorid of potvninen Heed See Ponfien: Ae July, 1868. = e 
