90 CONTRIBUTIONS TO MINERALOGY. [bull. 2*2 
The derivative was dark, but on heating over the bunsen harne] 
the color disappeared, and on treating- the ignited residue wit/i nitric 
acid red fumes were given off, showing that a quantity of free silve] 
oxide was present. This was not determined, but is contained in tin 
figures given for Ag s O. The silver oxide reported is therefore sev 
eral per cent too high. 
The compound is easily decomposed by warm dilute nitric acid 
with the separation of sandy silica. A complex breaking up of th( 
molecule has taken place and no simple ratios appear. 
EI^EOMTE. 
Ela3olite from Litchfield, Me., was heated in the usual w r ay witl 
thallous nitrate. An incomplete analysis of the leached residue gav< 
the following results: 
Insoluble in nitric; acid . 46. 34 
A1 2 3 27. 90 
T1 2 8. 50 
Na 2 0+K 2 () 15. 40 
Water, etc undet. 
In the leach water was found 2.13 per cent of sodium and potassiui 
oxides. The analysis shows that eheolite is but slightly attacked b 
treatment with thallous nitrate. 
^EGIRITE. 
iEgirite from Magnet Cove, Arkansas, was heated in a sealed tut 
with dry silver nitrate. The following results were obtained on ai 
alysis of the leached residue: 
Insoluble in nitric acid . 91. 22 
Al 2 3 +Fe 2 3 1.18 
CaO small 
Ag 2 G 4. 12 
Na 2 53 
Water, etc undet. 
This mineral has evidently been but little altered by the action 
silver nitrate. 
