SLSR i aa ree Ye oe Re A 
W. J. Knowlton on a new mineral from Rockport, Mass. 225 
borax, giving a distinct reaction for iron. With microcosmic 
salt it dissolves partially, leaving a white siliceous skeleton. 
Cooke states that the mineral is easily and completely re- 
of earth which could not be further purified by treatment with 
fluorid of ammonium and sulphuric acid. 
the filtrate, from 8 to 18 per cent were precipitated in ete 
ll 
€xperiments, according to the quantity of free sulphuric acid in 
culty ; bisulphate of soda would doubtless be preferable, but I 
have not employed it in quantitative analyses. The mineral is 
more readily resolved by fusion with fluorid of ammonium and 
“w0sequent treatment with sulphuric acid. The decomposition 
8 perfect, but of course the silica must be estimated by loss. In 
four analyses I obtained the following results: 
No. 1 No. 2. 0. 3. No. 4. 
Silica, 2629 2637* 2648* 26-18 
Zirconia, 61:33 61-00 000 —«6460F 
Cerium metals, 2-24 1:80 2°19 1:40 
n, FeO, 3°65 3°63 3°60 ' 
Uranium, Ur,0,, sce 2°83 1-40 
Tin, with CuO, 35 ‘70 "35 41 
er 58 455 4°55 458 
Tace manganese and 
98°44 10000 100-00 98°97 
In these analyses the water was determined by heating the 
* Silica estimated by difference. 
t Tica analyeer testi and iron were not separated. 
4X. Jour. Sct.—Szcoxp Sentes, Vor. XLIV, No. 131.—Sepr., 1867. 
29 
magn 
Trace of fluorine, 
