steiger.] ACTION OF SILVER NITRATE, ETC., ON SILICATES. 
77 
Considering the various amounts of alkali contained in the silver 
residues as unaltered analeite, deducting the equivalent amount and 
reducing t ho remainder to LOO, the above analyses give the results 
shown below:" 
A. 
B. 
c. 
Theoretical 
AgAl 
Si,()„.II,(). 
SiO, 
40.39 
17.27 
36. 65 
5. 69 
40. 28 
15. 92 
39. 78 
4.02 
39. 21 
15.90 
39.16 
5. 73 
39. 35 
A l,o.. 
16.72 
Ag 2 
38. 03 
H 2 
5. 90 
100.00 
100. 00 
100.00 
100. 00 
For comparison, there is given in the last column the percentage 
composition of theoretical silver analeite. Residue B shows a defi- 
ciency of water, possibly owing to the use of too high a temperature in 
drying the powder before analysis. Residue C gives the following 
molecular ratios: 
26Ag 2 0, 24A1 3 3 , lOOSiO,, 49H 2 0, 
agreeing well with the empirical formula 
AgALSiArHA 
Two thallium derivatives were prepared from the same lot of anal- 
eite, as follows: 
E. Natural analeite was heated in a sealed tube with four times its 
weight of thallous nitrate, twenty-four hours at 250°-290° C, 
F. Same as F, except that the heating was continued for forty - 
pight hours. The composition of the two leached residues is given 
li)elow. 
E. 
F. 
no, 
34. 40 
15. 73 
47. 29 
.60 
.62 
. 70 
32. 06 
u 2 o 3 
13.62 
\0 
53. 01 
fa 2 
. 12 
I 2 0- 
.20 
k 2 o+ 
.40 
99.40 
100.01 
("In these and all other deductions made in this work the theoretical molecule has been assumed, 
this case, NaAlSLOoH.O. 
