290 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [bull. 168. 
NEW YORK, PENNSYLVANIA, DELAWARE. 
Partial analysis by 
Analyses by 
A. Clay, near Richfield Springs, New York. 
Charles Catlett, record No. 946. 
B, C. Clays, Northumberland County, Pennsylvania. 
Charles Catlett, record No. 952. 
D. Kaolin, Hockessin, Delaware. P. R. C. 149. 
E. Portion of D insoluble in sulphuric acid. 
F. Portion of D soluble in sulphuric acid. 
Analyses D, E, and F by George Steiger, record No. 1626. 
A. 
B. 
c. 
D. 
E. 
F. 
SiO, 
49.65 
| 23. 82 
trace 
6.48 
undet. 
undet. 
| 16. 18 
65.97 
20.37 
2.75 
.52 
.64 
.05 
3.32 
1 6.28 
59. 16 
18.68 
10.32 
.67 
.52 
.11 
3.35 
| 6.87 
48.73 
37.02 
.79 
.11 
.16 
.04 
.41 
.52 % 
12.83 
.17 
.03 
29.55 
18. 44 
.27 
trace 
.02 
.02 
.41 
19. 18 
18.58 
.52 
.11 
.14 
.02 
none 
ALA 
Fe 2 3 
MgO 
CaO 
Na 2 
K 2 
H 2 Oatl00°... 
H 2 above 100° 
Ti0 2 
6.84 
.11 
undet. 
5.99 
.06 
undet. 
2 
p 2 5 
96.13 
99.90 
99.68 
100. 81 
55.66 
44.60 
