NOTES ON SOME IGNEOUS ROCKS OF JAPAN 565 



On comparing the analyses, it is obvious that the two rocks 

 are closely similar in chemical characters, but the rock of Kasa- 

 yama differs slightly in containing lower magnesia, lime, and alka- 

 lies, and higher iron and titanium; the low value of the first com- 

 ponent especially does not satisfy Harker's hypothesis with regard 

 to the plotting of his diagram. 

 • Norms, calculated from the analyses, are as follows: 



A B 



Quartz 14.8 10.9 



Orthoclase 8.9 7.2 



Albite 16.8 26.7 



Anorthite 35.3 31.4 



Corundum 0.2 .... 



Diopside 7.1 



Hypersthene 16.9 8.6 



Magnetite 3.7 6.3 



Ilmenite 2.4 0.9 



99.0 99.1 



From the norms, ratios are given as below: 



A B 



Sal 

 Fern 



Q = 



F 



3-30 3-33 



o. 24 0.17 



K 2 Q / + Na 2 Q / 



C 

 K 2 0' 

 Na 2 0' : 



CaO' °' 38 °- 57 



o-. 50 0.25 



By the Quantitative System these rocks are classified as 

 bandose. 



