CLARKE.] 
CHERT AND SILICEOUS SINTERS. 
251 
SILICEOUS SINTERS. 
From the Yellowstone National Park and similar localities. De- 
scribed by W. H. Weed in 9th Ann., p. 619. Analyses A to H, inclu- 
sive, by J. E. Whitfield, record Nos. 97, 100, 707, 708, 812, and 998; 
analysis 1 by E. A. Schneider, record No. 1254. A to E from Yellow- 
stone National Park. 
A. Dried siliceous jelly from Emerald Spring, Upper Basin. 
1>. Sinter from Solitary Spring, Upper Basin. 
C. Grayish sinter from margin of Splendid Geyser. 
D. Compact sinter from Old Faithful Geyser. 
E. From Asta Spring, Hillside Group. 
F. G, H. Three samples of sinter from Rotorua, New Zealand. For 
comparison with Yellowstone sinters. 
1. Sinter from Mount Morgan gold mine, Queensland, Australia. 
Described by Weed in Am. Journ. Sci., 3d series, vol. 42, p. 165. 
Si0 2 
MA 
FeA .... 
MgO 
CaO 
Na 2 
K 2 
H 2 (ign.) 
NaCl 
S0 3 
C, organic 
H, organic 
93.37 
1.16 
trace 
.05 
.29 
.11 
.02 
4.17 
.08 
.31 
.78 
.07 
100. 41 
B. 
93.88 
1.73 
.14 
.07 
.25 
.28 
.23 
3.37 
.18 
.20 
100. 33 
c. 
81.95 
6.49 
trace 
.15 
.56 
2.56 
.65 
7.50 
trace 
.16 
100. 02 
D. 
89.54 
2.12 
trace 
trace 
1.71 
1.12 
.30 
5.13 
trace 
trace 
99.92 
E. 
89. 72 
1.02 
trace 
2.01 
7.34 
trace 
100. 09 
Si0 2 
A1 2 3 
Fe 2 3 
MgO 
CaO 
Na 2 
K 2 
H 2 Oat 105°. 
Ignition 
92.47 
2.54 
3.99 
99. 94 
G. 
90. 28 
3.00 
trace 
.44 
6.24 
99. 96 
n. 
74. 63 
15. 59 
trace 
1.00 
.30 
1.02 
43 
99. 97 
94.02 
2.27 
(race 
.07 
1.07 
2. 29 
99. 72 
