248 K. JiMBo : 



Sliimotsuke, also at a place near Tsukuba in Hitachi, &c. 

 Pebbles of biotite-scliist from tlie Toyogawa river and from 

 Chikueazawa in Mikawa contain small decomposed andalusite 

 crystals, like those observed by Koto, &c., near Kankyozan in 

 Hitachi and other places. 



According to Kikuchi and Nishiwada, chiastolite crystals 

 in clay-slate, with a sectional diameter measuring about 0.2 cm., 

 are found at Usuginu in Kikuchû. 



85. Sillimanite. 



Only found as microscopic aggregates in the mica schist near 

 Tsukuba in Hitachi, and also in the shape of eyes in the bio- 

 tite schist of Okunoin on Hongûzan in Mikawa. 



86. Cyanite. 



Sasamoto, &g. found cyanite without terminal faces, at the 

 contact of crystalline schist with diorite at Ogushi in Hizen. 



87. Topaz. 



The two principal localities of topaz in Japan are Takayama, 

 &c., in Mino, and Tanokamiyama in Omi. Hiki (Journal of 

 the Science College of the Imperial University of Tokyo, 1895) has 

 described the crystal form and other characters of the Mino crystals 

 and the etching figures of those of Mino and Omi. Ko has 

 given general characters of the Omi specimens. Those from 

 Mino are often rounded by rolling, but those of Omi are less 

 deformed. The difference is probably due to the greater length 

 of the river course, along which the Mino crystals were rolled 

 downwards by water. 



Mino. — The larger crystals from Takayama, &c., have 

 mostly domatic, but sometimes basal or pyramidal, terminations. 



