CLAIIKE.J 
IGNEOUS AND CRYSTALLINE ROCKS. 
43 
The following rocks are from Prospect Hill, west of Litchfield. 
Collected by W. H. Hobbs, who furnishes the petrographic data: 
D. Mica-hornblende-norite. Bandose. Contains plagioclase, hyper- 
thene, biotite, subordinate green hornblende, and magnetite. 
E. Hornblende-mica-diorite. Ifessose. Contains plagioclase, green 
hornblende, subordinate biotite, and magnetite. 
F. Hornblendite. III. 6. %.. 4, 5. Almost entirely green hornblende. 
Contains also magnetite, a little biotite, and very little plagioclase. 
G. Hornblende-saxonite. TV. I 2 . I 2 . 2. Mainly hypersthene, with 
subordinate olivine, green hornblende, and magnetite. 
H. Hornblende-norite. Auvergnose. Contains greenish hornblende 
and a little more hypersthene. Rich in plagioclase, with accessory 
biotite and magnetite. 
Analyses D, G, H, by W. F. Hillebrand, record No. 2074; E and 
F by George Steiger, record No. 2071. 
Si0 2 .. 
A1 2 3 . 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oatl05°... 
H 2 above 105 c 
Ti0 2 
Zr0 2 
co 2 
PA 
s 
NiO . . - 
MnO.. 
BaO... 
SrO... 
Li 2 .. 
FeS 2 ... 
CuFeS 2 
VA- 
Cu.... 
50.46 
19. 65 
1.66 
5.15 
5.31 
9.66 
3.15 
1.57 
.74 
1.14 
1.18 
trace? 
none 
.18 
trace 
.15 
.09 
.03 
trace? 
trace? 
100. 12 
E. 
47.97 
17. 41 
2.06 
9.09 
5.93 
9.12 
3.08 
.85 
.30 
1.11 
2. 10 
37 
10 
99.92 
38. 02 
14.64 
5.69 
10. 33 
10.26 
9.11 
1.90 
1.66 
.74 
2.35 
4. S4 
none 
.09 
.12 
99. 75 
G. 
47.87 
6.09 
1.40 
8.14 
16.33 
14.49 
.87 
.55 
.26 
1.07 
1.20 
trace?. 
.75 
.07 
ii. 
.25 
.04 
.20 
none 
none 
none 
.51 
.07 
a little 
100. 16 
49.28 
15.76 
1.86 
6.94 
8.21 
10. 51 
2.58 
.76 
.47 
1.10 
.87 
trace? 
.36 
.11 
.03 
.09 
.20 
trace? 
none 
none 
.99 
.13 
(?) 
100. 25 
