12 



B. Koto: 



SiO, 44.98% 



ALO3 ....15.50 

 FeXX.... 5.15 



Norms. 



Orthoclase (K.OAlAôSiOo) ... 7.8 



Albite (NaoOALOsßSiO.) 23. 1 



Anortliite (CaOAL032Si02).... 14.G 



Nepheline (Na20A]o032SiO,)... 11.9 



rCaOSiOO 



Diopside iMgOSio.,> 93 



iFeOSiO,,') " 



rw ' (2MoOSiO..) -, A 



Magnetite (FeOFe.Oa) 7.4 



Ilmenite (FeOTiOJ 5.5 



Apatite (3CaOP.A\) ••. 1.0 



Total 99.49 Sp. Gr. 2.947—2.950. 



From the ratios expressed b}' the above norms, om' rock findti 

 its final position in the C.I.P.W. quantitative system, as in the 



In sampling the material for the chemical analysis, all the 

 necessary precautions were taken by the writer. The analytical 

 result shows near approach to that of the basalt from Franklin 

 Island, Antarctic. The ]Manchurian rock has. however, a 



1) Calculations made by Kôzii. 



