22 
ANALYSES OF EOCKS, U. S. GEOLOGICAL SUKVEY. 
[bull. 168. 
G. Sodalite, deep blue. P. R. C. 77. 
H. Cancrinite, bright orange yellow. P. R. C. 77. 
I. Cancrinite, pale } r ellow, cleavable. 
J. Cancrinite, pale yellow, granular. 
SiO,. 
A1 2 3 
Fe 2 3 
MgO 
CaO. 
Na 2 
K 2 0. 
H 2 0. 
MnO 
co 2 . 
Cl... 
0=C1 
B7.33 
81.87 
ii. 
36. 29 
30. 12 
trace 
24. 56 
.10 
1.07 
6.83 
101. 76 
1.54 
100.22 
4.27 
19. 56 
.18 
2.98 
trace 
6.96 
100.36 
35.83 
29. 45 
trace 
5.12 
19. 33 
.09 
3.79 
trace 
6.50 
100.11 
37. 22 
28. 32 
trace 
.07 
4.40 
19.43 
.18 
3. 86 
trace 
6.22 
99. 70 
