194 



ART. 3. — B. KOTÙ : 



quite common occmTence (pp. 156, 172, 186), although they are 

 not usually recognized as such under the microscope. Hypersthene 

 and basic plagioclase associate either with ophitic relation, or in 

 hypidiomorphic granular aggregate. Olivine, if present, occupies the 

 centre of patches peripherally corroded and fringed with vermiform 

 magnetite. See Text-figs. 39 and 40. 



The £ type (PI. XXL Figs. 3-4). In April, 1915, F. Omoei 

 found amongst éjecta a round reddish granitic body, 8 cm. in 

 diameter, coated with black vitreous lava, between the second and 

 third vent of the eastern side. On close examination it turned out 

 to be a eucritic mass^^ of probably segregate origin. A specimen 

 of similar motex is in our Institute from the island of Nii-jima of 

 the Izu group. 



It is an hypidiomorphic 

 aggregate of anorthite (0.8- 

 1.5 mm.) and small pyroxenes 

 {O.l^j mm.), including hypers- 

 thene and augite in ophitic 

 fabric. Anhedral olivine 

 (0.15 mm. and less) is abund- 

 antly represented, being con- 

 stantly enclosed in the feldspar 

 (Text-fig. 44). Anorthite is of 

 the same character as in 

 the aforementioned gabbroids. 

 This stone-meteorite-like ac- 



Kig. 44. — Feldspar-phenocryst iu the eastern 

 lava-field at Yébino-tsiika. x 18. 



1) The rock closely resembles an aerolite called evicrlte not only in its minéralogie com- 

 liosition, but also in its motex, being loose-granular, and the essential component, anorthite, also 

 shows anomal double-refraction and undulatory extinction. Being absolutely holocrystalline hyp- 

 idiomorphic and partly iJoikiUtic, we fail to find interstitial glass cement of a composition of 

 feldspar called maskelynite in ' Meteoritenkunde.' Here the interstitial spaces, if any, are void 

 and emi)ty. 



