148 Seybert’s Analysis of Pyroxene. 
cipitate was formed. which entirely redissolved in the ex- 
cess of Alcali; therefore no Alumina was dissolyed by the 
nitro-muriatic acid. The ammoniacal liquor was supersatu- 
rated with muriatic acid, and boiled with an excess of sub- 
carbonate of Soda; the white precipitate of sub-carb. of 
zinc thus formed, after being well washed and strongly 
calcined, yielded 0.06 gr. of oxide of zinc on 3 gt. or 
2.00 per 100. : 
The dark coloured precipitate was dissolved, inthe hu- 
mid state, in acetic acid ; the solution was evaporated care- 
fully to a perfectly dry mass, which, after ebullition with wa- 
ter, was filtered: the peroxide of iron collected on the filter, 
ed 0.43 gr. of Tritoxide of Manganese, equivalent to 0.397 
grammes of Protoxide on 3 gr: or 13.233 per 100. 
: ' per 100 parts, 
A. Loss by calcination, 01.166 containing oxygen 
5.333 22 
B. Silica -802 
C, Alumina 02.000 
C. Oxide of Zinc 02.000 —— 
C. Peroxide of Iron 09.333 02.861 
C. Protoxide of Manganese 13.233 02.900 
D, Lime 0.666 05.805 
FE, Magnesia 04.333 
98.064 11.566 
100.000 
