CLARKE.] 
IGNEOUS AND CKYSTALLINE ROCKS. 
25 
G. Syenite-porphyry. Contains orthoclase, plagioclase, microper- 
thite, hornblende, quartz, augite, magnetite, biotite, apatite, and zircon. 
H. Granite-porphyry. Composition like D, but with more quartz. 
I. Basic segregation in H. Contains hornblende, green and brown 
augite, biotite, quartz, microperthite, magnetite, little apatite, and 
zircon. 
J. Diorite. Contains hornblende, augite, biotite, plagioclase, titan- 
iferous magnetite, sphene, zircon, and quartz. 
K. Diorite. Composition like J. 
L. Another sample of K. 
Si0 2 
A1 2 3 
FeA- 
FeO 
MgO... 
CaO 
Na 2 
K,0 
H 2 OatllO°... 
H 2 above 110° 
TiO, 
PA ---- 
Zr0 2 
MnO 
(NiCo)O 
BaO 
C0 2 
F 
CI 
FeS 2 
Less 
G. 
64.88 
16.24 
1.37 
2.70 
.89 
1.92 
5.00 
5.61 
.19 
.46 
.69 
.13 
.13 
.14 
none 
.06 
none 
.08 
.04 
none 
100.53 
.04 
73.69 
12.46 
1.21 
1.75 
.17 
.36 
4.47 
4.92 
.14 
.24 
.28 
.04 
.14 
.15 
none 
none 
trace 
.05 
.02 
none 
100. 09 
.02 
100.49 I 100.0/ 
56. 53 
16.47 
1.58 
5.40 
2.67 
4.90 
5.59 
3.80 
.23 
.60 
1.40 
.27 
.03 
.20 
trace 
trace 
.05 
.19 
.07 
trace 
99.98 
.09 
99. 
52.12 
16.35 
3.68 
6.02 
4.14 
7.25 
3.65 
2.34 
.25 
.88 
2.10 
.89 
.02 
.17 
trace 
.04 
.07 
.03 
.09 
.24 
100. 33 
.03 
100. 30 
57.97 
a 17. 28 
2. 23 
3. 75 
2.20 
4.33 
4. 31 
4.12 
.18 
.57 
1.54 
.64 
.15 
trace 
.07? 
.05 
.04 
undet. 
.32 
99.75 
.02 
99. 73 
64.62 
16.46 
1.82 
2.14 
1.10 
2. 39 
4.57 
5.21 
.13 
.39 
.81 
.21 
.03 
.12 
none 
.03 
.11 
undet, 
.05 
.19 
100. 38 
.01 
100. 3; 
a Including Zr(J 2 . 
