T. S. Hunt on some American Minerals. 343 
precipitated with the cerium by oxalic acid, which was alsos 
thrown down by ammonia, was insoluble in potash, and but 
slightly soluble in solution of carbonate of ammonia, yielded no 
insoluble salt with sulphate of potash, and was soluble in dilute 
acids after ignition, was regarded as yttria, to which alone all 
these characteristics belong. The two filtrates from the double 
salt of cerium, containing yttria and a persalt of iron, were mix 
and precipitated by potash; the ignited precipitate dissolved in 
hydrochloric acid with a slight odor of chlorine, indicating a re- 
maining trace of ceric oxyd. Tartaric acid and ammonia in ex- 
cess having been added to the solution, the iron was thrown down 
as sulphuret, and on boiling the filtrate a white bulky precipitate 
fell; which carbonized on ignition, and finally left a whitish resi- 
due, readily soluble in hydrochloric acid with a slight evolution 
of chlorine, and yielding a solution which was copiously precipi- 
tated by ammonia, and left on spontaneous evaporation a crys- 
talline salt, which was not deliquescent. 
The quantitative analysis was performed upon 405 grammes 
of the mineral, which lost 001 grm. by ignition. It was decom- 
p by sulphuric acid, and the bases separated by the processes 
just described ; these are not exact, as yttria and oxyd of cerium 
are both somewhat soluble in an excess of solution of carbonate 
més gave the following results: 
ES ee 
Peroxyd of uranium, .- . 069 = cs 
Protoxyd of iron, = oe ‘11 
Yttria, . : tM ny a "395 
Oxyds of cerium, ete., ’ NL. = QA 
Loss on ignition, . - + 
