CLARK E.J 
IGNEOUS AND CRYSTALLINE ROCKS. 
273 
A. 
B. 
c. 
D. 
E. 
F. 
BiOo 
62. 11 
62. 19 
17.43 
1.65 
2. 64 
.10 
.86 
8.28 
5.03 
.14 
.39 
.37 
.04 
.02 
.14 
undet. 
none 
trace 
none 
.32 
,03 
none 
trace 
none 
49. 55 
17.78 
4. 65 
5. 89 
2.49 
7.01 
6.12 
2. 29 
.29 
.34 
2. 09 
.01 
none 
1.10 
(?) 
45. 48 
11.87 
1. 98 
9. 87 
13. 28 
10. 97 
2.21 
. 77 
.23 
.74 
1.90 
none 
none 
.25 
(?) 
37. 50 
9.12 
5. 59 
X. 81 
13.72 
13.85 
2.69 
.63 
1.05 
2.35 
3.21 
.02 
.27 
. 90 
.05 
trace 
.07 
.04 
.15 
.07 
.05 
trace 
.05 
15 84 
ALO, 
7. 68 
1.47 
.47 
FeA 
FeO 
MgO 
3. 39 
CaO 
.85 
6.89 
4. 82 
| «1.60 
5.21 
2 28 
K,0 
.60 
ILOat 105° 
H. 05 
p 2 above 105° 
''2. 35 
TiO, 
.05 
Zr0 2 
CO, 
.27 
P 2 Or 
.90 
CI 
.03 
S 
Cr 2 O s 

none 
none 
.28 
.05 
.08 
none 
.015 
.03 
.08 
.04 
.16 
.04 
trace? 
none 
.04 
•03 
(?) 
(?) 
In A1,0 3 
(?) 
In CaO 
NiO (CoO) . ....... 
MnO 
BaO 
BrO 
Li,0 : 
(?) 
(?) 
(?) 
ko, . 
FeS 2 
99. 24 
99.93 
100. 065 
99.94 
100. 19 
41.59 
aLoss on ignition. ''Assumed. 
GUATEMALA. 
Volcanic dust from the volcano Santa Maria, collected on deck of 
steamer Luxor, 60 miles distant in San Benito Harbor, October 25, 
1902. Tellowstono.se. Analysis by E. T. Allen, record No. 2011. 
Si0 2 
A1,0, 
FeA 
FeO . 
MgO . 
CaO.. 
Na 9 . 
59. 38 
19.86 
3. 84 
2.17 
1.18 
5.80 
4.92 
1.15 
H,0 above 105 c 
TiO, 
SO a 
100. 33 
MnO, and BaO are present. 
Bull. 228—04 18 
