300 
ANALYSES OF KOCKS, TT. S. GEOLOGICAL SURVEY. 
[no. 228. 
The following foreign sinters were analyzed for comparison with 
the Yellowstone Park specimens: 
P, Q, R. Three samples of sinter from Rotorua, New Zealand. 
Analyses by J. E. Whitfield, record No. 998. Discussed by Weed 
in 9th Ann., p. 619. 
S. Sinter from Mount Morgan gold mine, Queensland. Described 
by Weed in Am. Journ. Sci., 3d series, vol. 42, p. 165. Analysis by 
E. A. Schneider, record No. 1254. 
P. 
Q. 
R. 
s. 
Si0 2 
92. 47 
2.54 
90.28 
3.00 
74. 63 
15. 59 
94.02 
A1,0, 
} 2.27 
Fe 2 3 
MgO 
.15 
.79 
trace 
.44 
trace 
1.00 
.30 
1.02 
trace 
Cat) 
.07 
Na 2 
K 2 
H 2 at 105° 
1.07 
Ignition 
3.99 
6.24 
7.43 
2.29 
99.94 
99.96 
99.97 
99.72 
