332 Mr. Seybert’s Analysis of Glassy Actynolite. 
grammes; but as the protoxide of iron contained in the 
mineral must, during the calcination, have passed to the 
state of peroxide, and as the absorption of oxygen, estima- 
ted by calculation, is 0.011 grammes, therefore the mois- 
ture expelled by calcination amounts to 0.031 grammes on 
3 grammes, or 1.033 per hundred. ‘ 
B. The calcined mineral (4) was exposed to a red heat 
during thirty minutes, in a silver crucible, with 9 grammes 
of caustic potash. The cold mass was of a pale green co- 
lor; it communicated to the water with which it was treat- 
ed, a lemon yellow color, thus indicating a trace of chrome. 
The mixture was treated, in the usual manner, with an ex- 
cess of muriatic acid, and the yeilow solution thus produc- 
_ed, was evaporated to a dry gelatinous mass, which was 
treated with diluted acid and again moderately evaporated. 
The residue was treated with more water, and the solution 
was filtered; the silica collected on the filter, after being 
washed and calcined, weighed 1.69 grammes on 3 grammes, 
or 56.333 per 100. 
C. After the liquor (B) was neutralized with caustic pot- 
ash, on the addition of the hydro-sulphate of potash, a black 
precipitate was formed, which, after being washed and cal- 
cined with nitric acid, weighed 0.19; this precipitate, when 
treated with caustic potash, was found to consist of 0,14 
dager os: peroxide of iron, and 0.05 grammes of alumine, 
y difference 1.666 per 100. Owing to the green color of 
the mineral, the iron must be estimated as a_protoxide, 
and the 0.14 grammes of peroxide are equivalent to 0.129 
rammes of protoxide on 3-grammes, or 4.30 per 100. 
he alkaline liquor holding the alumine in_ solution, 
appeared to be yellow from chrome contained in the min- 
eral; to detect the chrome, the alumine was precipitated, 
by exactly neutralizing the liquor with muriatic acid; on 
the addition of acetate of lead, there was produced a precip- 
itate of muriate of lead, intermixed with a yellow precipi- 
tate of chromate of lead; to another portion of the liquor. 
nitrate of silver was added ; the muriate of silver was like- 
wise intermixed witha red precipitate of chromat of silver, 
but the chrome seemed to be ver trifling. 
_ D. When oxalate of potash was added to the liquor (C) 
it occasioned a white precipitate, which, after a strong cal- 
cination, afforded 0.32 grammes of lime on 3 grs- or 10.666 
_per 100. 
