Jegiger.] ACTION OF 8ILVEE NITRATE, ETC., ON SILICATES. 87 
This compound is perfectly white. It is easily dissolved by dilute 
nitric acid, giving a perfect jelly on evaporation. 
The optical observations were: Double refraction low, cleavage ver- 
tical, extinction parallel, probably biaxial. It was entirely crystalline. 
She molecular proportions are as follows: 
30Tl 2 O, 3CaO, lNa 2 0, 35A1,() :! , L00SiO 2 , 9H 2 0; 
or, combining monoxide bases, 
R' 68 Al 70 Si 100 O 339 . 9H 2 0, 
which corresponds closely to the formula R 2 Al 2 Si 3 O 10 . 
SCOIiECITE. 
The scolecite used came from Whale Cove, on the island of Grand 
Manan, New Brunswick. 
One derivative was made by heating the scolecite in a sealed tube 
with four times its weight of silver nitrate six hours at 250°-280' C. 
The residue was dried at about 35° C. 
3i0 2 
ig 2 combined 
lg 2 free 
JaO.. 
s'a,( ) . 
1,0- 
Scolecite. 
45. 86 
25. 7S 
13. 92 
.41 
.40 
13. 65 
100.02 
Residue. 
37. 28 
21.51 
20. 21 
6. 67 
5. 40 
.44 
.46 
7. 92 
99. 92 
Molecular 
rat ius. 
100.0 
34.0 
14.0 
15.5 
1. 1 
70. S 
This residue was dark In-own, owing to the silver oxide it contained. 
|)n heating over the low flame of the Bunsen burner in order to reduce 
le silver oxide to metallic silver it turned perfectly white. 
On attempting to mount this preparation for microscopic examina- 
ion the balsam became very dark, which prevented any optical obser- 
ations from being made. 
The molecular ratios for this derivative are: 
14Ag 8 0, 16CaO, lNa 2 0, 34A1 2 3 , 100SiO 2 , T1H 2 0, 
uniting monoxide bases, 
-^ 62Ai 6 8^ 1 100^3335 
71H 2 0. 
