638 S. KOZU 



those of the modern pyroxene-andesites, which are widely spread 

 over the Japanese Islands, judging from a cursory glance over 

 the volcanic rocks of Japan. For this reason the name bandose 

 appears to be particularly appropriate. 



ANORTHITE-CRYSTALS IN THE LAVA OF 1909 



The occurrence of the larger crystals of anorthite is noteworthy. 

 The crystals form large phenocrysts in the lava, and have been 



Fig. 4. — Cavity with anorthite crystal. Natural size 



ejected separately also as the so-called "anorthite bombs," and are 

 scattered abundantly around the crater; as. is the case with the 

 anorthite on Miyake-jima, 1 one of the Seven Izu Islands, Zao-san, 

 a volcano in the province of Rikuzen, and Iwate-san, a volcano in 

 the province of Rikuchu; the oligoclase-andesine 2 on Naka-io-jima, 

 one of the Sulphur Islands, may be cited as the parallel examples. 



1 Kikuchi, "On Anorthite from Miyake-jima," Journal of the College of Science, 

 Imp. Univ. Japan, II, Part I, p. 31. 



2 Wakimizu, "The Ephemeral Volcanic Island in the Iojima Group (Sulphur 

 Islands)," Publications of the Earthquake Investigation Committee, 1908, No. 22 C, 

 Tokyo. 



