352 ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
NEW YORK, x°ENNSYLVANIA, DELAWARE. 
A. Clay, near Richfield Springs, New York. Partial analysis by 
Charles Catlett, record No. 946. 
B, C. Clays, Northumberland County, Pennsylvania. Analyses by 
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. 1026. 
A. 
B. 
c. 
D. 
E. 
F. 
Si0 2 
49. 65 
| 23. 82 
trace 
6.48 
undet. 
undet. 
1 16. 18 
65. 97 
20.37 
2.75 
.52 
.64 
.05 
:;. 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 
ALO, 
18. 58 
Fe.,0, 
.52 
MeO 
.11 
CaO 
.14 
Na,0 
.02 
K 2 
none 
H 2 at 100° 
H 2 above 100° 
6.84 
.11 
undet. 
5. 99 
TiO, 
.06 
P 2 5 
undet. 
96.13 
99.90 
99.68 
100. 81 
55. 66 
44.60 
