28 
ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. 
[no. 228. 
G. Nordmarkite. Phlegrose. Contains orthoclase, plagioclase, 
microperthite, hornblende, quartz, augite, magnetite, biotite, apatite, 
and zircon. P. K. C. 1343. 
H. Hornblende-paisanite. Liparose. Composition like U, but with 
more quartz. P. R. C. 1348. 
I. Basic segregation in H. Akerose. Contains hornblende, green 
and brown augite, biotite, quartz, microperthite, magnetite, little 
apatite, and zircon. P. R. C. 1349. 
J. Diorite. Andose. Contains hornblende, augite, biotite, plagio- 
clase, titaniferous magnetite, sphene, zircon, and quartz. P. R. C. 1344. 
K. Windsorite. Toscanose. Contains plagioclase, orthoclase, quartz, 
biotite, magnetite, ilmenite, and very small amounts of diopside, 
apatite, and zircon. P. R. C. 134.). 
G. 
H. 
I. 
J. 
K. 
Si0 2 -.-. 
A1 2 0. } 
64.88 
16.24 
1.::; 
2.70 
.St) 
L.92 
5. 00 
5.61 
.19 
.46 
.69 
.13 
.13 
.14 
none 
.06 
none 
.08 
.04 
none 
73. 61) 
12.46 
1.21 
1.75 
.17 
.36 
4.47 
4. 92 
.14 
.24 
.28 
.04 
.14 
. L5 
none 
none 
trace 
.05 
.02 
none 
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 
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 
64.62 
16.46 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
1.82 
2.14 
1.10 
2.39 
4.57 
K 2 . 
5. 21 
H 2 OatllO° 
.13 
H 2 above 110° 
.39 
Ti0 2 
P 2 
.81 
.21 
25 
Zr0 2 - 
.03 
MnO - 
.12 
(NiCo)O 
none 
BaO 
co 2 
.03 
.11 
F 
undet. 
CI. 
.05 
FeS 2 
.19 
Less O 
100. 53 
.04 
100. 09 
.02 
99.98 
.09 
100. 33 
.03 
100. 38 
.01 
100. 49 
100. 07 
99.89 
100. 30 
100. 37 
