370. On American Spodumene. 
ae 
* Arr. XXXVIL—On American Spodumene ; by Geo. J. Brusu, 
of the Yale Analytical Laboratory. 
Read before the American Association for the Avlvancement of Science at Naw 
Haven, August, 1850. 
Owrne to the want of a complete anal ysis of an American Spod- . 
umene, I was induced at the suggestion of Prof. Silliman, Jr., to 
undertake this researc 
The Spodumene from Uté has often been the subject of chem- 
ical investigation and has been analyzed by Arfvedson,* Stro- 
meyer,t Regnault,f and Hagen.¢ That from the Killiney local- 
_ ity has been analyzed by Thomson. | 
These are all the complete sac recorded of this species. 
Partial analyses, however, exist of specimens from the Tyrol 
mountains, and from Sterling, Mass. ., the former by Hagen and 
the latter by both Hagen and Bowen.{ 
The constitution of this mineral was not wet th ee 
prior to Hagen’s analysis, until which time it had been consid- 4 
ered as essentially a silicate of alumina and lithia. Sige how- | 
ever found a portion of the so-called lithia to be soda, which dis- 
covery being confirmed renders the formulas derived from former | { 
analyses incorrect, owing to the great difference in the atomic 
weights of lithia ar nd:soda. * Hagen’s analysis of a specimen from 
the Ut6 locality gave, ° 
Silica; 66136 — 3456 3436 1226 12 
Peay fen 321 ae iene he ae 
pee eee 
100-000 
from which he deduced the formula, Na Sitahi Sito! Siz. 
My aualyses agree with Hagen’s in the soda, but lead to a 
different formula. The specimens selected for analysis were 
from the Norwich and Sterling (Mass ) localities. A qualitative 
examination of each, showed the sees of silica, alumina, per- 
oxyd of iron (trace), lime, lithia, and so 
In the quantitative examination the alkalies were obtained by 
decomposition by hydrofluoric acid and determined as sulphates ; 
the other constituents were obtained by fusion with carbonate of 
soda. That from Norwich in two analyses yielded, 
icc 
M cwape gS Jour., xxii, 
+ U baa yar i, 426. 
SE og tit ser mies) 1839, 580. q ice xlviii, 371. 
iL Am. Jour., viii, 121. 
