268 
ANALYSES OF KOCKS, U. S. GEOLOGICAL SURVEY. [no. 228. 
F. Diorite, Karluk Cliffs, Kadiak Island. Bandose. Contains labra- 
dorite and hornblende, with subordinate quartz, biotite, and magnetite. 
(I. Diorite, Lane and Hayward mine, Silver Bow Basin. Shoshon\ 
use. Contains plagioclase, biotite, hornblende, and scattering grains 
of quartz, with secondary chlorite, epidote, and muscovite. 
H. Diorite, Treadwell mine, Douglas Island. Tuolwnnose. Con- 
tains plagioclase, mostly albite, with secondary quartz, calcite, and 
pyrite, the latter apparently replacing ferromagnesian silicates. 
I. Hornblende-andesite, Bogoslof Island. Andose. Described by 
Merrill in Proc. U. S. National Museum, vol. 8, p. 31. Contains 
hornblende, augite, plagioclase, tridymite, grains of iron ore, a little 
apatite, and probably sanidine. P. R. C. 315. 
J. Like I, but darker colored. Andose. Contains more hornblende, 
no glass, and little or no tridymite. Same locality, also described by 
Merrill. Analyses I and J by T. M. Chatard, record Nos. 209, 210. 
P. R. C, 316. 
Si0 2 . . 
A1A- 
Fe 2 : , 
FeO . . 
MgO . 
CaO . 
Na 2 0. 
K 2 0.. 
H 2 Oatll0°..__ 
H 2 above 110° 
TiO, 
V 2 3 
NiO. 
MnO 
SrO. 
BaO. 
Li 2 0. 
C0 2 . 
FeS 9 . 
F. 
G. 
H. 
I. 
J. 
61.58 
54. 20 
63.01 
56. 07 
51. 54 
15.89 
15.86 
18.47 
19.06 
20. 31 
2. 19 
:;. 32 
.06 
5.39 
4. 04 
5. 50 
4. 14 
.32 
.92 
3. 56 
2.69 
3. 51 
.06 
2. 12 
3. 16 
6.49 
5.32 
2.66 
7.70 
9. 55 
:;.oi 
3. 28 
10.01 
4.52 
4.29 
.51 
3. 30 
.39 
1.24 
2.47 
.16 
1.26 
.55 
2.40 
.05 
.27 
} . 09 
} .34 
.63 
1. 35 
.13 
1.24 
.32 
.12 
.68 
.06 
.01 
none 
.06 
.16 
.57 
trace? 
.20 
.02 
.19 
.23 
.32 
trace? 
.06 
trace 
.04 
.41 
trace 
trace 
.02 
none 
none 
.06 
1.45 
.26 
2.01 
2.10 
100. 38 
100. 28 
99.69 
99.64 
101. 07 
