CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
227 
F. Diorite, Karluk Cliffs, Kadiak Island. Contains labradorite and 
hornblende, with subordinate quartz, biotite, and magnetite. 
G. Diorite, Lane and Hay ward mine, Silver Bow Basin. Contains 
plagioclase, biotite, hornblende, and scattering grains of quartz, with 
secondary chlorite, epidote, and muscovite. 
H. Diorite, Treadwell mine, Douglas Island. Contains plagioclase, 
mostly albite, with secondary quartz, calcite, and pyrite, the latter 
apparently replacing ferromagnesian silicates. Contains 0.01 V 2 3 . 
I. Hornblende-andesite, Bogoslof Island. 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. 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 
A] 2 3 
Fe 2 3 
FeO 
MgO '... 
CaO 
Na 2 
K 2 
H 2 Oat 110°... 
H 2 above 110 
Ti0 2 
P 2 5 
NiO.. 
MnO 
SrO 
BaO 
Li 2 
co 2 
FeS 9 
F. 
G. 
H. 
I. 
J- . 
61.58 
54. 20 
63.01 
56.07 
51.54 
15.89 
15.86 
18.48 
19.06 
20. 31 
2.19 
3.32 
.06 
5.39 
4.64 
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 
3.04 
3.28 
10.01 
4.52 
4.29 
.51 
3.30 
.39 
1.24 
2.47 
.16 
1.26 
.55 
2.40 
.05 
.27 
1 . 99 
! ■« 
.63 
1.35 
.13 
1.24 
.32 
.12 
.68 
.06 
.16 
.57 
trace ? 
.02 
none 
.20 
.19 
.06 
.23 
.32 
trace ? 
.06 
trace 
none 
.06 
.04 
.41 
trace 
1.45 
.26 
trace 
.02 
none 
2.01 
2.10 
100. 38 
100. 28 
99.69 
99. 64 
101.07 
