NOTES ON THE MINERALS OP JAPAN. 275 



Numerous flat felspar crystals with rounded edges and a 

 black coating were collected by Kikuchi at Iwöjima in the 

 south-eastern corner of Japan. They are about 1 cm. long and 

 seem to have been found in loose crystals just in the mode 

 of the anorthite crystals of Miyakejima. The nature of this 

 mineral has not yet been studied. 



KôsHiNZAN near Ashio in Shimotsuke. — Saitö has found 

 numerous good porphyritic crystals of anorthite in an agglome- 

 rate of this place. The largest individual measures about 15 cm. 

 in length. Crystalline habit is thick columnar, with faces oP, 

 'P,F, ,P, F„ a>T, œP', ,P,^, 2,F,^, 2'P^, 2F^. 



122. Titanite. 



At and near the mines of Kamioka in Hida, are found in 

 diorite numerous, small, yellow-coloured titanite crystals. They 

 are like a letter-envelope in shape, and measure sometimes 0.6 cm. 

 in length. An analysis by Yoshida is as follows : 



99.77 



At Kinkwazan in Rikuzen, Koto has found brown titanite 

 crystals in granite. 



123 Natrolite. 



This mineral is found at Osawa in Nikkö in Shimotsuke, 

 Maze in Echigo, Shioda in Shinano, Ohara in Iwaki, &c. 



