PETROLOGY: IDDINGS AND MORLEY 533 
Chemical Analyses of Rocks From Luzon, P. I. 
1 
2 
3 
4 
s 
6 
SiOz 
50.54 
52.33 
53.06 
58.54 
60.13 
72.68 
AI2O3 
21.63 
17.18 
19.68 
16.79 
17.51 
15.77 
FesOs 
3.64 
3.51 
3.24 
1.89 
3.25 
0.65 
FeO 
4.22 
5.73 
4.94 
3.33 
0.91 
0.21 
MgO 
3.06 
5.30 
3.64 
3.27 
3.35 
0.41 
CaO 
10.47 
10.71 
9.41 
7.25 
6.54 
1.66 
NaaO 
2.88 
3.17 
3.24 
3.76 
3.78 
3.26 
K2O 
1.57 
0.94 
0.94 
1.62 
0.77 
2.19 
H2O- 
0.19 
0.00 
0.01 
0.04 
1.45 
1.18 
H2O+ 
0.72 
0.38 
0.06 
1.24 
0.90 
1.38 
m 
0.34 
0.31 
0.77 
0.70 
0.44 
0.09 
P2O6 
0.24 
0.22 
0.33 
0.66 
0.68 
0.22 
CO2 
0.04 
0.02 
0.00 
0.69 
0.02 
0.00 
7rn« 
0.00 
0.00 
0.00 
0.01 
0.00 
0 on 
CI 
0.08 
0.08 
0.08 
0.04 
0.09 
0.02 
F 
0.02 
0.05 
0.07 
0.05 
0.02 
0.01 
S 
0.01 
0.03 
0.03 
0.04 
0.02 
0.05 
CrzOa 
0.01 
0.01 
0.00 
0.01 
0.00 
0.00 
MnO 
0.17 
0.24 
0.59 
0.13 
0.27 
0.16 
BaO 
0.05 
0.07 
0.06 
0.04 
0.03 
0.02 
SrO 
0.04 
0.03 
0.02 
0.01 
0.01 
0.03 
99.92 
100.31 
100.17 
100.31 
100.17 
99.99 
Norms ' 
q 
0.90 
0.96 
4.98 
11.94 
18.00 
41.46 
9.45 
5.56 
5.56 
9.45 
5.00 
12.79 
ab 
24.63 
27.25 
27.25 
31.96 
31.96 
27.77 
an 
41.14 
29.75 
36.42 
24.19 
27.52 
7.51 
c 
0.31 
5.30 
di 
8.34 
18.27 
6.80 
5.81 
hy 
8.00 
11.82 
11.85 
8.97 
8.40 
1.00 
mt 
5.34 
5.10 
4.64 
2.78 
2.78 
0.93 
il 
0.61 
0.61 
1.52 
1.37 
0.76 
0.15 
hm 
1.44 
ap 
0.34 
0.34 
0.67 
1.68 
1.68 
0.34 
1.16 
0.67 
0.33 
2.17 
2.54 
2.69 
99.91 
100.33 
100.02 
100.32 
100.39 
99.94 
1. Basalt, hessose, II.5.4.4. Antipole. 
2. Basalt, andose-hessose, II (III). 5. (3)4.4'. Taal volcano, 
3. Labradorite-andesite, hessose, II,'5.'4.4'. Mayon volcano. 
4. Hornblende-andesite, tonalose, II.4'.3.4. Benguet road. 
5. Hornblende-andesite, placerose-tonalose, (I) II.4.3'.4(5), Olongapo. 
6. Dacite, alsbachose, 1.3.2.4. Corregidor Island. 
