NOTES ON THE MINERALS OF JAPAN. 229 



show ID basal sections a peculiar distribution of liquid cavities, 

 by which white and purple sectors with edges parallel to the 

 hexagonal sides are produced. Mineral enclosures are very nu- 

 merous in the rock-crystal from Kai and consist of tourmaline, 

 actinolite (?), pyrite, epidote (?), &c.; sulphur was found in one 

 or two specimens. Grey-coloured minute spheres are enclosed in 

 the rock-crystal of Kurodake and in the amethyst of Ohara. 



Natural etching figures on a smoky quartz crystal from 

 Kamikane in Kai Province, are essentially similar to those des- 

 cribed by Molengraaf in Groth's Zeitschrift, 1888. The trian- 

 gular depressions on ±R measure about 0.07 cm. along their 

 longest side (larger holes of this kind were discovered by Ko in 

 the smoky quartz of Mino Province). The depressions on co p 

 are not so difftinct as in Molengraaf's descriptions ; long trian- 

 gular scratches and rectangular hillocks on ^^ seem not to have 

 been found in his specimens ; besides there are found on some 

 crystal edges irregular grooves, which are not at all mentioned 

 by him. 



A smoky quartz from Tenjinbaru in Obira in Bungo Pro- 

 vince bears tiiangular etching figures on ±R as in the specimen 

 from Kamikane. 



The rock-crystal of Kurodake shows a kind of etched 

 depressions on ccP, not like those in Molengraaf's descrip- 

 tion. Polygonal (mostly four-sided) depressions on the rhombo- 

 hedral faces of quartz from Kawahake in Shinano Province, collect- 

 ed by Hoshina, &c., are also most probably referable to etching. 

 Minute flat hillocks, whose triangular bases are bounded by 

 slightly curved lines, are very numerous on the roughened part 

 of rhombohedral faces in the smoky quartz of Höki. These 

 hillocks are more pointed in outline, than those produced by 



