su 



NOTES ON THE MINERALS OF JAPAN. 245 



H. Phosphates, Arseniates, Niobates, &c. 



73. Fergusonite. 



Irregular columnar individuals of fergusonite with fibrous 

 rface occur in the tin placers of Takayama. According to 

 Takimoto, there are occasionally found crystals about 0.7 cm. 

 in length, terminating in pyramids. 



74. Monazite. 



Red-brown crystals, more than 0.5 cm. in diameter, with 

 curved faces, and found enclosed in the topaz crystals from 

 Tanokamiyama in Omi, were determined by Ogawa as monazite 

 after a qualitative analysis made by a chemist of the Geological 

 Survey. 



75. Apatite. 



Good crystals of this mineral are very rare in Japan. We 

 find, in old collections, a few yellowish crystals from Miya- 

 moto (?) in Kai Province with oP, coP^ C0P2, &g. Their 

 rough faces are covered with a white powder. The specimens 

 are sometimes 8 cm. in diameter ; there are partings parallel to 

 oP and CO P. 



A semi-transparent glassy crystal, about 5 cm. in diameter 

 of basal sections, and showing oP, <^F, C0P2, |P, |P, and 

 mP2, is found in Wada's collection and is said to have come 

 from Miyamoto. This specimen, which differs from the above 

 only in having smooth shining faces, is the best specimen of 

 macroscopic apatite crystals thus far discovered in Japan ! 



