NOTES ON SOME IGNEOUS ROCKS OF JAPAN 
Norms, calculated from the analyses, are as follows: 
665 
A 
Ouantzeeyaen i: se | i 3 
Orthoclase...... B17, 31 
PADIte Ry ee er 41.9 46 
Anorthite ...... 8.6 8 
Corundum...... es: ae 
Nepheline...... ae ns 
Diopside....... ae 2. 
Hypersthene.... 5.8 
Olivines 32 5-. Igenesess ee 
Magnetite...... 3.0 Q. 
Hematite... 5.) = Stee sate 
Ilmenites- 2... 0.6 
IDNBWs Ba 6a dos 1.0 
-OAHN 
* NN COOH 
- OFROO 
Oro 
The ratios of the rock from Oki are as follows: 
CaO’ 
By the Quantitative System, the rock may be classified as pulas- 
kose, near lauvikose. 
As will be seen from the above description, the present rock is 
chemically close to acidic akerite, that is, pyroxene-syenite, but it 
has mineralogically and chemically a close relation to the syenite 
The petrographical 
characters of the rock show also some relation to normarkite on 
the one hand and to umptekite on the other. 
that the Oki rock is characterized, by mineralogical and chemical 
properties intermediate with respect to nordmarkite, umptekite 
and akerite, though it is nearer to the last type. 
from Belknap Mountain, New Hampshire. 
So it is concluded 
